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Kitchen Sink Plumbing

Kitchen Sink Plumbing

Prepare for the New Kitchen Sink Before you begin this project, read the manufacturer’s instructions and follow all local building codes. If you’re not comfortable installing a kitchen sink or related components (faucets and garbage disposers), Lowe’s can do it for you. Select the appropriate type of replacement sink. Single- and double-bowl drop-in sinks can be installed into most countertop surfaces. Undermount sinks install beneath the counter and should only be used with solid-surface and natural or engineered stone countertops. These instructions are for installing a drop-in sink. Step 1 Measure your existing sink. If your new sink has different dimensions and drain location(s) than the unit it will replace, you may need to modify the countertop opening and / or plumbing. Good to KnowFor best results, make a drawing of your old sink with all measurements including distances from the sink wall to the drain center to use as a shopping aid and reference. Or you can remove your old sink, take it to Lowe’s, and ask a Lowe’s associate to help you select a replacement unit. CautionWear safety glasses when working under the sink or cutting pipe and other materials. Step 2 Decide if you will also replace the faucet or install additional components such as a sprayer, soap dispenser, on-demand hot water tap or filtered water tap.Standard sinks have 1, 2, 3 or 4 holes on the rear lip for a faucet and additional components.Installation of a new faucet and other components is easier if it is done when you are installing a new sink, since you can easily access the hardware with the sink out of the countertop.
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Kitchen Sink Plumbing

Remove the Old Sink Before you begin, snap a picture of your plumbing configuration. This serves as a handy reference if you’re having trouble reassembling the plumbing later. Step 1 Turn off both the hot and cold water supply lines. The shutoff valves typically are in the cabinet below the sink or in the basement. If you cannot find them, turn off the main water line to the house. Step 2 Turn on the faucet to relieve water pressure in the lines. Step 3 Use adjustable wrenches to disconnect the water supply lines to the faucet. Have a small bucket ready to catch any water left in the supply lines and drainpipes as they are removed. Good to KnowLeave the faucet attached to the sink. You can remove both the sink and the faucet as one unit. Step 4 If you have a garbage disposer, turn off the circuit, then unplug it. Use pliers to disconnect the drainpipe and P-trap from the sink drain. Keep a bucket or pan underneath the drain to catch excess water. Step 5 Then remove the dishwasher drain line. Step 6 Remove the disposer following the manufacturer’s instructions. If you don’t have your disposer instructions, check the manufacturer’s website. Have a bucket ready to catch any water. Most disposers loosen at the mounting bracket connection to the sink drain and twist off. Step 7 Locate the metal clips under the counter around the sink’s perimeter. Loosen them with a screwdriver, open-end wrench or socket wrench and swing them toward the sink bowl. Step 8 Cut the caulk around the sink with a utility knife. Step 9 Push the unit from underneath and lift the old sink away. Step 10 Use a putty knife to remove grime, caulk and old plumber’s putty from the countertop. Likewise, clean any components you will re-install.
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Kitchen Sink Plumbing

In this video, This Old House plumbing and heating expert Richard Trethewey shows how to plumb a double-bowl sink. Steps: 1. Turn off the water to the sink cabinet and remove the cabinet doors for easier access. 2. Attach a shut-off valve to a length of copper tubing. Tighten the compressing fitting using two adjustable wrenches. Repeat to make a second shut-off valve assembly. 3. Connect the shut-off valves to the hot- and cold-water supply lines inside the sink cabinet. Confirm that the valves are off, then turn the water back on. 4. Install the faucet spout and faucet handles to the countertop. 5. From inside the cabinet, connect the faucet’s hot- and cold-water supply lines to the shut-off valves. Carefully tighten each threaded connection with an adjustable wrench. 6. Apply plumber’s putty to the underside of each basket strainer. 7. Set the strainers into the drain holes in the bottom of each sink, then tighten from below with a wrench. Scrape away any excess putty from inside the sinks. 8. Connect a brass tailpiece to the underside of each basket strainer. 9. Dry-assemble the ABS drainpipe and trap. Cut the pipe to length with a plastic-pipe cutter. 10. Glue the drainpipes to each trap using ABS cement. 11. Install a mini-vent valve to the drainpipe. 12. Connect one trap to the tailpiece protruding down from the sink. 13. Measure and cut a length of brass drainpipe to extend horizontally from the second sink trap to the T-fitting above the first trap. 14. Connect the brass drainpipe to the traps. 15. Attach the dishwasher discharge hose to the port on the side of the drainpipe. Tighten the hose clamp with a screwdriver. 16. Twist open the shut-off valves and check for leaks. 17. Replace the cabinet doors.
kitchen sink plumbing 3

Kitchen Sink Plumbing

Step 1 Measure your existing sink. If your new sink has different dimensions and drain location(s) than the unit it will replace, you may need to modify the countertop opening and / or plumbing. Good to KnowFor best results, make a drawing of your old sink with all measurements including distances from the sink wall to the drain center to use as a shopping aid and reference. Or you can remove your old sink, take it to Lowe’s, and ask a Lowe’s associate to help you select a replacement unit. CautionWear safety glasses when working under the sink or cutting pipe and other materials.
kitchen sink plumbing 4

Kitchen Sink Plumbing

Measure your existing sink. If your new sink has different dimensions and drain location(s) than the unit it will replace, you may need to modify the countertop opening and / or plumbing. Good to KnowFor best results, make a drawing of your old sink with all measurements including distances from the sink wall to the drain center to use as a shopping aid and reference. Or you can remove your old sink, take it to Lowe’s, and ask a Lowe’s associate to help you select a replacement unit. CautionWear safety glasses when working under the sink or cutting pipe and other materials.
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Kitchen Sink Plumbing

Choosing a Sink When it comes to the quality of sink materials, you get what you pay for. An inexpensive stainless-steel sink flexes when you push on it, scratches easily, and is difficult to keep clean. A higher-quality, heavier-gauge (6- or 8-gauge) stainless-steel sink, such as one with a burnished finish, is a better choice. If you opt for a stainless-steel sink, make sure the underside is well coated with sound-deadening insulation. Enameled cast-iron sinks come in a variety of colors; they last much longer than enameled steel sinks. Acrylic sinks have the look of enameled cast iron, and the higher-end models are nearly as durable. Both cast-iron and acrylic sinks have insulating properties, so water stays warm longer than it does in a stainless-steel sink.
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Kitchen Sink Plumbing

Other sink installations A flush-mounted or underhung sink makes for easier cleaning, but these styles require special countertop treatments. Install a flush-mounted sink with its rim resting on plywood substrate. Install cement backerboard on the top up to the edge of the sink, and cover it with tiles that partially overhang the sink flange. Install and plumb an underhung sink after the substrate is installed. Then install tiles as shown, with cut pieces along the perimeter and bullnose trim pieces overlapping them.
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Kitchen Sink Plumbing

There aren't many reasons for changing out the drain pipes under a kitchen sink, but one of the most common is during a kitchen renovation when the sink is being replaced. The steps for installing the sink drain will depend on how different the new sink is from the old one, as well as what other components are being installed. In older homes, the new sink may not be a different depth than the old one, so some alteration of the drain pipes may be necessary.
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Most bath sinks don’t have a strainer, but they do have a pop-up stopper so the sink can be easily filled with water. The pop-up stopper fits into a drain body that is connected just like a kitchen sink’s strainer body, as shown at right. (For more information, see Bathroom Sink Plumbing.
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Steps: 1. Turn off the water to the sink cabinet and remove the cabinet doors for easier access. 2. Attach a shut-off valve to a length of copper tubing. Tighten the compressing fitting using two adjustable wrenches. Repeat to make a second shut-off valve assembly. 3. Connect the shut-off valves to the hot- and cold-water supply lines inside the sink cabinet. Confirm that the valves are off, then turn the water back on. 4. Install the faucet spout and faucet handles to the countertop. 5. From inside the cabinet, connect the faucet’s hot- and cold-water supply lines to the shut-off valves. Carefully tighten each threaded connection with an adjustable wrench. 6. Apply plumber’s putty to the underside of each basket strainer. 7. Set the strainers into the drain holes in the bottom of each sink, then tighten from below with a wrench. Scrape away any excess putty from inside the sinks. 8. Connect a brass tailpiece to the underside of each basket strainer. 9. Dry-assemble the ABS drainpipe and trap. Cut the pipe to length with a plastic-pipe cutter. 10. Glue the drainpipes to each trap using ABS cement. 11. Install a mini-vent valve to the drainpipe. 12. Connect one trap to the tailpiece protruding down from the sink. 13. Measure and cut a length of brass drainpipe to extend horizontally from the second sink trap to the T-fitting above the first trap. 14. Connect the brass drainpipe to the traps. 15. Attach the dishwasher discharge hose to the port on the side of the drainpipe. Tighten the hose clamp with a screwdriver. 16. Twist open the shut-off valves and check for leaks. 17. Replace the cabinet doors.

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