Q&A for How to Install a Bathroom Sink

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Does the sink need to be connected to the vent in the wall? If so, how is that done?

Community Answer

The tailpiece should be connected to the P-trap, which is connected to your drainage system. That will create the connection to the venting in the wall.

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Question

What are the two holes/big slots on the top of the drain assembly?

Community Answer

These are for the sink's overflow. Not every sink has an overflow anymore, and most that do no longer plumb it in this fashion.

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Question

Do sinks have measurements on them?

Community Answer

No, not that I've ever seen. Most don't even have a manufacturer or model # either.

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Question

When I turn on the water in the sink or flush the toilet in my master bath, I have a leak down in the basement. Do I need a new wax seal, and is the water from the sink on the same pipe?

Community Answer

No, that's nothing to do with the toilet's wax seal, since the sink is causing the same result. You have a broken drain line or one of its fittings, shared by the toilet and sink. A wall and or ceiling below needs to be opened in order to find and permanently fix the break.

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Question

What should I do if the shut off valves are stuck?

Community Answer

In that case, you would need to either call a plumber or get new valves at your local home improvement store to install yourself.

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Question

I don't want to install the pop-up that comes with the faucet set I'm about to install. Is there something I should do?

Community Answer

If using the same pipe, cap it off, and use a stopper in your sink. You can also use a new straight piece of pipe, but always check for leaks.

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Question

If a spray nozzle hose that has a snap on connection comes apart, how does it go back together?

Community Answer

Typically, you pull the collar on the hose end away from the end and release it once the nozzle's snap adapter is fully seated into the hose end. It may not have been installed correctly, and if someone just shoved the nozzle into the snap connector, then that's likely why it came off to begin with. You pull the collar back again to remove the nozzle.

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Question

What if you don't want to use the drain stop?

Community Answer

Keep it anyway. They're good when you're away on long trips or vacations and can be used to keep the water in the sink's trap from evaporating. You don't come home to a place that smells like a sewer, nor one that's full of methane and ready to explode. This stuff has happened!

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