
Installing a plastic laundry sink is a great way to upgrade your laundry room and make daily chores a breeze. It is a simple half-day project for those with plumbing experience, but for those who are new to DIY, it is best to hire a professional. The placement of the sink should be close to the washer, as this is a source of hot and cold water and a drain point. Before beginning, ensure that you have all the necessary tools and safety gear, such as gloves and protective eyewear. Check local building codes and obtain any necessary permits. This guide will take you through the process of installing a plastic laundry sink, from preparing the space to connecting the water supply lines and drainage.
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What You'll Learn

Planning and preparation
First, assess your laundry room layout and select the best location for your sink. Choose a spot close to existing plumbing lines and your washing machine to simplify the installation. Ensure there is enough space for both the washing machine and the sink, considering the dimensions of the room and the size of the fixtures. Check local building codes and obtain any necessary permits. This step is crucial, as you may need approval for any plumbing or electrical work.
Next, gather the necessary tools and materials. This includes safety gear such as gloves and protective eyewear, as well as plumbing components like a P-trap or drain trap, appropriate connections, and a utility knife. If you plan to attach a faucet, ensure you have the correct type, along with any required accessories such as a soap dispenser. If your sink did not come with legs, you may need to purchase some, along with leveling feet.
Before beginning any installation, ensure you have turned off the home's main water supply line. If there are any circuit breakers controlling wires that run through the walls, turn those off as well. This will help prevent any accidents or damage during the installation process.
Now you are ready to begin preparing the space for the sink. If there is drywall covering the wall behind where the sink will be placed, you will need to remove key sections of it. Use a stud finder to locate the position of the studs and the current supply and drainage points. With the utility knife, slice through the drywall tape and remove the screws. Then, pry back the drywall sheets.
Finally, prepare the plumbing connections. Depending on your setup, you may be able to tap into your existing drain line with a Y-fitting and extend a PVC pipe to the sink area. Alternatively, you may need to install a separate drain line for the sink. If you are connecting to the water supply lines, use a copper pipe cutter to cut into the hot and cold supply lines. Insert a tee on each line and run PEX lines through the holes in the studs to the sink location.
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Attaching the legs
Prepare the Utility Tub:
Begin by turning the utility tub upside down. This will expose the bottom of the tub basin, allowing you to easily access the leg slots.
Insert the Legs:
Locate the leg slots, which are usually found at each corner of the tub basin. Place a leg into each slot, positioning it securely in the corner. Gently tap the leg into the slot using a hammer. It is recommended to place a book or a piece of wood at the bottom of the leg to avoid damaging the plastic tub during this process.
Secure the Legs:
After inserting each leg, try to wiggle it to ensure a snug fit. The leg should feel firm and secure when tapped into place. You can also use a flat-head screwdriver to tighten the leveler to the leg, providing additional stability.
Test Stability:
Once all four legs are attached, turn the utility tub upright again. Test the stability of the legs by gently trying to move or wobble the tub. If installed correctly, the legs should feel sturdy and the tub should not wobble excessively.
Level the Basin:
Use a bubble level or a laser level to ensure that the basin is level. Adjust the included levelling feet if necessary, until the basin is perfectly level.
By following these steps, you can securely attach the legs to your plastic laundry sink, ensuring a stable and functional installation.
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Connecting the water supply
Before you begin, make sure you have turned off the home's main water supply line. If there are any wires running through the walls, turn off all circuit breakers controlling them.
To connect the water supply to your laundry sink, you will need to tap into the existing water supply lines. First, locate the position of the studs that extend from the current supply point and drainpipe to the area where you intend to install the sink. Use a stud finder for this purpose. Next, use a utility knife to slice through the drywall tape joining the full sheets of drywall to each other. Remove the sheets by unscrewing and prying them back.
Now, drill two holes in each stud that leads to the intended location of the sink. Cover the front of each hole by hammering metal stud protector plates into the studs. Cut into the washer's hot and cold copper supply lines with a copper pipe cutter. Clean the burrs from the copper pipes, then insert a tee on each line, running two PEX lines through the holes in the studs to the sink location. Attach the hot and cold supply lines to the copper stub-outs. Use bend supports to direct each pipe at a 90-degree angle. Nail each pipe onto the side of the studs with fasteners. Use a Speed Square to ensure the pipes extend directly from the wall.
If you are installing a faucet, follow the manufacturer's instructions. You may need to drill holes in the sink deck; use a hole saw for this. Hand-tighten the braided stainless supply tube nuts onto the valves, then tighten one more revolution to create a good seal. If you are using new plastic drain parts, use a hacksaw to cut the trap arm and tailpiece to fit.
Finally, turn the water back on and test your pipe connections by running the water. Inspect all connections for potential leaks.
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Installing the drain trap
First, locate the drain trap kit provided with your sink. The kit should include components like the P-trap, rubber gaskets, a drain cap, and wall connector. Some kits may also include plastic screw caps and a rubber washer. Identify all the pieces and keep them organised and accessible during the installation process.
Next, build the drain trap according to the manufacturer's instructions. Start by placing the plastic screw caps onto the upright pipe, followed by the rubber gaskets. The P-trap should be positioned correctly, ensuring it matches the height of your wall connector. You may need to cut or adjust the length of the P-trap to achieve the proper alignment.
Now, it's time to attach the drain trap to the sink. Place the rubber washer onto the top screw of the P-trap, and then screw it tightly onto the tub. Use a wrench to give it an additional quarter turn to ensure a secure and leak-proof seal.
After the P-trap is firmly in place, line it up with your wall connector. Add the drain cap and gasket to the end of the P-trap, trimming the main pipe if necessary to ensure a neat connection. Screw the cap onto the connector and tighten it with a wrench, again turning it an extra quarter turn to prevent leaks.
Finally, check all your connections for potential leaks. Turn on the water supply and test the sink's functionality. Run water through the sink to verify proper drainage and ensure that all connections are secure and watertight.
Remember, installing a laundry sink can be a complex task, especially if you're unfamiliar with plumbing. If you encounter any challenges or are unsure about any steps, it's always best to consult a licensed plumber for assistance.
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Testing for leaks
Once you are confident that all connections are secure, turn on the water supply and test the faucet and sink's functionality. Run water through the laundry sink to verify proper drainage. Observe the sink, pipes, and surrounding areas for any signs of leaks or water accumulation. If you notice any leaks, turn off the water supply immediately and re-inspect all connections, tightening them as necessary.
If you are unable to identify the source of a leak, it may be located within the walls or under the cabinet. In such cases, it is advisable to consult a professional plumber. They have the expertise and tools to diagnose and address plumbing issues effectively.
To prevent leaks and ensure the longevity of your plastic laundry sink, consider using high-quality plumbing components and following the manufacturer's instructions for installation. Additionally, maintain your laundry sink by regularly checking for any signs of corrosion, worn-out washers, or loose connections.
Remember, leaks can lead to water damage and costly repairs if not addressed promptly. By regularly testing for leaks and maintaining your plastic laundry sink, you can keep your laundry area functional and dry.
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