Bathroom sink drain hookup

Diagrams and helpful advice on how kitchen and bathroom sink and drain plumbing works. Both kitchen and bath sinks operate very similarly; the main difference is that kitchen sinks are designed to be hooked up to more fixtures than a faucet, such as a water filter, a garbage disposal, and a dishwasher.

Most bathroom sinks just have a faucet and a drain.


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A sink drains by way of several components. A garbage disposal, if there is one, mounts directly to a special strainer body. See How a Garbage Disposal Works.

For more information, see Bathroom Sink Plumbing. Underneath the sink, a rubber gasket, metal washer, and large locknut or retainer tightens the body to the sink. A straight tailpiece mounts to the strainer body with a threaded coupling.

Slip-joint couplings connect the tailpiece, the main parts of a drain trap, and a short threaded nipple at a tee in the drainpipe. At the wall or the back of the cabinet, a trim piece called an escutcheon hides the connector and the nipple.

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Unscrew the nut from the inlet of the P-trap, and remove it and the plastic washer inside. Slide the nut up along the tailpiece and fit the washer around the end of the tailpiece.

How to install a new Sink Tailpiece and P Trap

Set the P-trap opening against the washer and push up until the trap outlet is level with the waste pipe. Slide the nut down and screw it to the trap, tightening it as much as you can by hand.

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How to Hook Up a Bathroom Sink Drain

The pipe should be about 2 inches longer than the distance you measured. Slide one end of the pipe into the adapter you glued onto the waste line and the other end into the trap outlet. You can get the clearance to do this by swiveling the trap. Tighten the compression couplings on the trap and the waste line by hand to secure both ends of the pipe.

Plastic P-trap compression fittings are meant to be hand tightened, but if any of the connections leak, use adjustable pliers, carefully, to tighten them more.


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  • You must use pliers to tighten metal P-trap connections. Use the thinner washer if the trap and tailpiece have the same diameters. If your sink has a pop-up stopper, be sure the hole in the tailpiece is facing the wall when you tighten the strainer.

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    Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since As a landscape builder, he helped establish two gardening companies. Skip to main content. Tip Plastic P-trap compression fittings are meant to be hand tightened, but if any of the connections leak, use adjustable pliers, carefully, to tighten them more.

    How to Plumb a Bathroom Vanity Sink Drain | Home Guides | SF Gate

    Warning Compression fittings may not work correctly if the pipes enter them at an angle. Installing a New Bathroom Sink Hammerzone: Bath Vanity and Lavatory: Part 2 -- Connecting the Plumbing. About the Author Chris Deziel has a bachelor's degree in physics and a master's degree in humanities.