Plumbing Under The Kitchen Sink: A Step-By-Step Guide
Whether you’re installing a new kitchen sink or simply replacing old pipes, plumbing under the kitchen sink can be a challenging task. The process involves connecting the sink to the building’s plumbing system, ensuring a watertight seal to prevent leaks, and making sure the sink is securely attached to the countertop. The sink drain pipe, usually 1 1/2 inches in diameter, connects the sink to the building’s drain system, and the choice of pipe material and fittings can impact the ease of installation and maintenance. Proper installation of the sink’s plumbing connections is crucial to avoid leaks and ensure the sink functions correctly.
How to Connect Plumbing Under a Kitchen Sink
| Characteristics | Values |
|---|---|
| Difficulty | Moderate |
| Required Skills | Plumbing experience |
| Tools | Silicone caulk, damp cloth, mounting clips, flexible supply lines, acorn-head supply tubes, braided stainless steel hoses, slip nut, slip washer, basket strainer, water filter, hot water dispenser, garbage disposal, hacksaw |
| Cost | $500 to $1,500 depending on the size and type of sink |
| Time | One day |
| Steps | Clean the countertop, apply a bead of silicone caulk, lower the sink into the cut-out, press down, check the alignment, wipe away excess caulk, attach flexible supply lines, connect the faucet to shut-off valves, check for leaks, fill the sink with water, run the garbage disposal, install a basket strainer, work around other fittings when connecting the drain pipes, temporarily install the tailpiece, connect the curved end of the continuous waste pipe to the garbage disposal, cut pipes to size, ensure pipes are smooth, lower the drain outlet |
What You’ll Learn
- How to connect a kitchen sink drain pipe?
- How to install a basket strainer?
- How to connect a dishwasher to the hot water supply?
- How to create a watertight seal?
- How to check for leaks?
How to connect a kitchen sink drain pipe
Before you begin, carefully plan the layout of your sink. If you are replacing an existing sink, you can remove it and jump straight to the installation of the new one. If you are installing a new sink, ensure you have purchased the correct sink bowl(s) and have existing wall plumbing in place.
Kitchen drains are usually 1 1/2-inch in diameter, but occasionally you may find a 2-inch kitchen drain outlet. Make sure you buy the right size, as well as the correct pipe material, which can be plastic, brass, or semi-cast. If you have a 2-inch kitchen drain outlet, you can use adapter fittings to transition a 1 1/2-inch drain kit to the 2-inch outlet pipe.
The drain tailpiece is a short vertical length of straight pipe that joins the sink strainer to a tee fitting. The side outlet on the tee fitting will accept the continuous waste pipe coming from the garbage disposal (or the other sink basin), while the bottom outlet will continue on to the drain trap. Temporarily install the tailpiece onto the sink strainer, using a slip nut (and slip washer, as applicable). Temporarily connect the curved end of the continuous waste pipe to the garbage disposal’s drain outlet, using a slip nut and washer. Let the straight end of the pipe extend past the vertical tailpiece on the sink basin.
If you are connecting two sinks with one plumbing outlet, you will have to merge the two sinks’ piping. Slide the nut onto the tailpiece before applying the washer underneath it with the beveled side facing down. Hold the first waste arm onto the tailpiece and screw the nut down onto the arm over the washer. Then, determine where the waste arm will connect to the tee and cut the pipe to the correct length. Next, attach the outlet tee by sliding the nut and washer onto the end of the first waste arm, then screw them into the outlet tee connection.
After you have connected the pipes, check for leaks by filling the sink with water. If you notice any leaks, tighten the connections carefully, making one-eighth turns until the leak stops.
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How to install a basket strainer
Installing a basket strainer is a straightforward process, but it can be tricky if you’re inexperienced with plumbing work. If you’re confident in your abilities, you can save on labour costs and complete the project at your own pace. Here is a step-by-step guide on how to install a basket strainer:
First, you need to identify the type of sink you have and the plumbing setup. Kitchen sinks usually have a 1 1/2-inch diameter drain, but occasionally you may find a 2-inch kitchen drain outlet. If you have a double-basin sink, the process will be similar, but you’ll need to work around additional fittings when connecting the drain pipes.
Next, gather your tools and materials. You will need a basket strainer, plumber’s putty or non-water-based silicone, a rubber gasket, a friction ring, and a locknut. You may also require a slip washer and slip nut to temporarily install the tailpiece onto the sink strainer. It is recommended to spend at least $50 on a high-quality basket strainer with a durable finish and reliable stopper mechanism.
Now, you can begin the installation:
- Roll the plumber’s putty between your hands to create a rope-like structure about the size of a pencil.
- Wrap the putty around the lip of the kitchen sink drain opening. If you cannot use plumber’s putty, a non-water-based silicone alternative can be used.
- Press the basket strainer firmly into the putty.
- Add the rubber gasket, friction ring, and locknut under the sink. Ensure the cardboard friction ring is inserted between the rubber gasket and the locknut.
- Tighten the locknut. If you are using silicone, wipe away any excess with a rag or paper towel.
- If your sink has a garbage disposal, connect the curved end of the continuous waste pipe to the disposal’s drain outlet using a slip nut and washer.
- The straight end of the pipe should extend past the vertical tailpiece on the sink basin.
- Once installed, test the basket strainer for leaks. Fill the sink with water and use a tissue to check for any water between the bottom of the drain and the sink.
If you encounter any issues during the installation process, such as a spinning basket or a rusted locknut, refer to online guides for troubleshooting tips.
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How to connect a dishwasher to the hot water supply
Connecting a dishwasher to the hot water supply is a straightforward process, but it’s important to be well-prepared and ensure you have the correct tools and materials. Before you begin, check your dishwasher’s installation manual for further information. If your machine is connected to a cold water supply, it will heat the water itself. Connecting to a hot water supply can decrease energy consumption, but you should use a hot-fill hose designed for hot water with a maximum temperature of 60°C.
Firstly, ensure you have the correct piping for your setup. Piping comes in plastic, brass, and semi-cast material, and any type can be combined. Kitchen pipes are usually 1 1/2-inch in diameter, but can occasionally be 2 inches, so make sure you buy the right size. Adapter fittings can be used to transition a 1 1/2-inch drain kit to a 2-inch outlet pipe. It is also recommended to use smooth pipes, as corrugated tubing can be susceptible to catching grease and food particles, leading to clogs.
Next, you will need to connect the dishwasher supply to the branch of the T and the faucet’s hot water to the run (top) of the T. It is recommended to buy another shut-off for the dishwasher and put it on the branch of the T, so you can isolate the dishwasher if needed.
Once you have made the connections, carefully tighten the joints and check for leaks. Fill the dishwasher with water to check for leaks and ensure proper drainage. If you notice any leaks, tighten the connections carefully, making one-eighth turns until the leak stops.
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How to create a watertight seal
Sealing a kitchen sink is an essential step in kitchen sink installation and maintenance, creating a watertight seal that keeps water and debris from entering gaps. To create a watertight seal, you will need to use a sealant that is 100% waterproof and resistant to mould and mildew.
Firstly, ensure that you have a clean work surface. If you are replacing old caulk or sealant, remove it completely, then wipe down the area with isopropyl alcohol. Allow the surface to dry before applying a new bead of sealant. For a smoother bead and easier clean-up, apply painter’s tape on either side of the area you are sealing.
Next, prepare your sealant by cutting the tip of the cartridge at a 45-degree angle, so the hole is about the same size as the area you are sealing. Cut the cartridge tip with a utility blade for clean results. Apply a continuous bead of silicone caulk around the underside of the sink’s lip, keeping the bead even and without gaps. Gently lower the sink, aligning it properly, and press down firmly to set the sink into the sealant. Wipe away any excess caulk with a damp cloth. Allow the sealant to cure completely according to the manufacturer’s instructions.
If you notice any leaks, tighten the connections carefully, making one-eighth turns until the leak stops. Fill the sink with water to check for leaks and ensure proper drainage.
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How to check for leaks
Before you begin to check for leaks, ensure you have dried off all the pipes and the surrounding areas. Then, systematically test the drain pipes. Most kitchen sink leaks occur on the drain lines, often due to loose or improperly connected slip joint connections.
Start by running water in both sink basins for two to three minutes each, carefully checking for leaks with a flashlight and a dry piece of paper towel. Begin your inspection at the highest points where the pipes/disposal connect to the sink basin(s). If you don’t find anything during this initial test, you can move on to a stress test on the drain pipes.
If you are unsure about what you are doing, or if you are unable to identify the source of the leak, it is best to call a professional plumber.
Checking for Leaks
- Inspect surrounding areas: Look for water stains or pooling under the sink and check nearby fixtures like the dishwasher for potential contributions to the leak.
- Use a flashlight: Illuminate dark areas to inspect hidden parts of the pipe for signs of leakage.
- Perform a dye test: Pour coloured water down the drain and watch for any escaping coloured water.
- Check the water supply lines: These lines connect the sink to the water supply and can develop leaks over time. Inspect for any visible signs of leakage or damage.
- Check the P-trap: The P-trap is the curved section of the pipe found under the sink that traps some water to prevent sewer gas from entering your home. It can get clogged with grease or food scraps over time, so regularly using a drain cleaner is recommended.
- Check the sink strainer and drain assembly: The leak might originate from the sink strainer and drain assembly, so focus on fixing those parts rather than the pipe.
- Check the slip joint connections: Most kitchen sink leaks occur on the drain lines, often due to loose or improperly connected slip joint connections.
- Check the seals and gaskets: The seals around the sink drain and faucet can wear out over time, leading to water leakage.
- Check the washers: Worn washers are among the most common causes of leaking sinks.
- Check the valve seat: When water sits around the valve seat, it can begin to corrode, causing the area around the spout to leak.
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Plumbing Your Kitchen Sink: A Step-By-Step Guide
Installing a kitchen sink can be a daunting task, especially if you’re not a seasoned DIY enthusiast. However, with the right tools, materials, and a clear step-by-step guide, you can successfully install your kitchen sink plumbing system and ensure it functions perfectly. This guide will walk you through the process, from preparing your workspace to testing for leaks, so that you can achieve a professional-quality result and save money by doing it yourself.
| Characteristics | Values |
|---|---|
| Difficulty | Installing a kitchen sink can be a daunting task, especially for beginners. However, with the right tools, materials, and a clear step-by-step guide, it can be a manageable task. |
| Skills Required | Basic plumbing knowledge is required for installation. |
| Time Taken | The time required to install a kitchen sink can vary depending on experience and complexity, ranging from 3 to 5 hours on average. |
| Cost | Doing it yourself can save you hundreds of dollars. The cost of a sink ranges from $500 to $1,500 depending on size and type. |
| Tools Required | Essential tools include a pipe wrench, adjustable wrench, pipe cutter, Teflon tape, plumber’s putty, and PVC pipes and fittings. |
| Materials Required | Materials required include a new sink, faucet, supply tubing, and a gasket. |
| Steps Involved | 1. Turn off water supply and disconnect water supply lines. 2. Remove the old sink and clean the surface. 3. Install the new sink by feeding the supply tubing and tailpiece through the gasket and up through the holes in the sink. 4. Secure the faucet by screwing on the mounting nuts and washers. 5. Install the drain assembly by applying plumber’s putty and inserting the drain flange. 6. Attach the gasket and locknut to secure the drain flange and tighten with a pipe wrench. 7. Connect the P-trap to the drain tailpiece and then to the drain pipe coming from the wall. 8. Turn on the water supply and test for leaks. 9. Clean up any excess plumber’s putty or silicone caulk. |
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What You’ll Learn
- Before you begin, take a picture of your plumbing configuration and turn off the water supply
- Remove the old sink and clean off any debris
- Install the drain assembly and connect the P-trap to the drain tailpiece
- Connect the faucet’s supply tubing and tailpiece through the gasket and up through the holes in the sink
- Test for leaks and clean up any excess plumber’s putty or silicone caulk
Before you begin, take a picture of your plumbing configuration and turn off the water supply
Before you start installing or adjusting the plumbing under your kitchen sink, there are a few important preparatory steps to take. First, take a picture of your plumbing configuration. This will serve as a handy reference if you have trouble reassembling the plumbing later. It is also a good idea to make notes about which pipes and components connect where. This way, you can ensure that you put everything back together correctly.
Next, you need to turn off the water supply. Locate the shut-off valves for both the hot and cold water supply lines. These valves are typically located in the cabinet below the sink or in the basement. If you cannot find them, turn off the main water line to your house. Once you have located the valves, turn them off. Then, turn on the faucet to relieve water pressure in the lines. It is important to have a small bucket ready to catch any water left in the supply lines and drainpipes as you remove them.
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Remove the old sink and clean off any debris
Removing the old sink is the first step in installing new plumbing underneath your kitchen sink. The process will differ slightly depending on the type of sink you have. There are two basic designs: under-mounted, which are attached to the countertop from underneath, and drop-ins, which simply drop into the sink opening in a countertop.
If you have a drop-in sink, you can start by pushing the unit from underneath and lifting the old sink away. If your sink doesn’t lift easily, it may still be attached to something. Check that all fixtures are uncoupled and that the caulk has been fully sliced through. If you have a garbage disposal, turn off the circuit and then unplug it. Use pliers to disconnect the drainpipe and P-trap from the sink drain, keeping a bucket or pan underneath the drain to catch any excess water.
For an under-mounted sink, you will need to angle it out of the cupboard doors, being careful not to damage any cabinet surfaces or remaining piping.
Once the old sink has been removed, use a putty knife to scrape away any leftover grime, caulk, and old plumbers putty from the countertop. Clean the surfaces with a multipurpose cleaner to ensure that the area is free of debris before installing the new sink.
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Install the drain assembly and connect the P-trap to the drain tailpiece
To install the drain assembly and connect the P-trap to the drain tailpiece, follow these steps:
First, turn off the water supply by locating the shut-off valve under your sink and turning it clockwise. This is an important step to prevent accidental leaks. If there is an old P-trap in place, use an adjustable wrench to loosen and remove the nuts securing it to the waste connector and the sink’s tailpiece.
Next, assemble the tailpiece and J-bend. If your wall outlet is not directly in line with your tailpiece, you may need to install a Form N Fit piece to bridge the gap between the tailpiece and the J-bend. Place a slip joint nut onto the tailpiece, then slide a washer underneath it with the beveled side facing down. Hold the Form N Fit up to the tailpiece and screw on the other slip joint nut on top of the washer.
Now, measure the required length of the wall tube by holding the J-bend to the tailpiece and measuring the distance from the wall tube outlet to the end of the J-bend. Mark the wall tube at the correct length, and cut the tube at the mark with a pipe cutter or hacksaw.
Slide a nut and slip joint washer from your P-trap kit onto the wall tube. Insert the wall tube into the waste connector and tighten the nut to connect the pieces securely. Position another nut and slip joint washer on the tailpiece, then slip the tailpiece into the J-bend, securing the seal with the washer. Ensure you tighten all the nuts to prevent leaks.
Finally, test your work by turning the water back on and allowing water to run down the drain. Check the slip-nut connections for any leaks. If you notice any leaks, use pliers to tighten the slip nut, making small movements to avoid overtightening.
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Connect the faucet’s supply tubing and tailpiece through the gasket and up through the holes in the sink
When installing plumbing for a kitchen sink, it is important to be well-prepared. Before beginning any plumbing work, carefully lay out your sink and ensure you have the right tools and materials. It is also crucial to turn off the water supply by turning the shut-off valves in a clockwise direction. You can locate these valves under the sink. Now, to connect the faucet’s supply tubing and tailpiece through the gasket and up through the holes in the sink, follow these steps:
First, feed the faucet’s supply tubing and tailpiece through the gasket. Ensure the gasket is properly aligned with the holes in the sink. Gently push the tubing and tailpiece up through the holes. The gasket will help create a seal to keep water from leaking out and prevent corrosion. Next, secure the faucet by screwing on the mounting nuts and washers from underneath. Before fully tightening the mounting nuts, make sure the faucet can swing in a full arc across the sink.
Now, apply a bead of plumber’s putty under the strainer’s lip. Push the strainer up through the sink’s drain hole. From underneath, slip on the gasket, washer, and housing (if included). Apply pipe-joint compound to the exposed threads. Thread the locknut onto the strainer by hand, then tighten it with pliers while holding the strainer in place.
Finally, check for leaks. Turn on the water supply valves slowly and run the water at full blast. Observe all connections along the supply and drain lines for any leaks. If you notice any leaks, tighten the connections carefully and check again. You can use a flashlight to improve visibility when checking for leaks.
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Test for leaks and clean up any excess plumber’s putty or silicone caulk
Once you’ve finished installing the plumbing underneath your kitchen sink, it’s important to test for leaks and clean up any excess plumbers putty or silicone caulk. Even a small leak can cause damage to your cabinets, so it’s important to be thorough in your testing. First, remove everything from underneath the sink and dry off the garbage disposal, drain pipes, shut-off valves, and supply lines with a dish rag or paper towel. Pay special attention to the nooks and crannies, and note any spots where water immediately reappears, as this could indicate a leak.
After everything is dried off, test the drain pipes, as leaks often occur on the drain lines, especially on loose or improperly connected slip joint connections. If you’re having trouble locating the source of a leak, consider calling a professional plumber. They deal with these issues daily and can quickly diagnose and fix most leaks.
To clean up any excess plumbers putty, start by removing as much as possible with a blade or cloth. Plumbers putty can take a while to dry, so if it’s still pliable, it should come off fairly easily. For any residual stains or dried putty, you can use a solvent or mineral spirit to clean it off. Alternatively, you can try to break off the dried putty with your hands or a putty knife, but be careful not to injure yourself or damage the surface.
Silicone caulk can also be used to seal joints and fixtures, and it’s important to clean up any excess before it dries. Most silicone caulk will be dry to the touch within 30 minutes to an hour, but it’s best to leave it untouched for at least 24 hours to fully cure. If you need to remove any excess, use a sharp tool like a utility knife or razor blade to cut it away, being careful not to damage the surrounding surfaces.
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Frequently asked questions
What are the benefits of installing plumbing for my kitchen sink myself?
Installing your kitchen sink yourself can save you hundreds of dollars, and you can also focus on other projects around the house. You will also have more flexibility in completing the project rather than relying on a professional’s availability.
What tools do I need to install plumbing for my kitchen sink?
Essential tools for installing a kitchen sink plumbing system include a pipe wrench, adjustable wrench, pipe cutter, Teflon tape, plumber’s putty, and PVC pipes and fittings.
What is the first step in installing plumbing for my kitchen sink?
Before you begin, take a picture of your plumbing configuration. This will serve as a handy reference if you have trouble reassembling the plumbing later. Then, turn off both the hot and cold-water supply lines.
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