Installed new bathroom faucet and drain. After installing water is leaking underneath
From the drain. Have reinstalled and used plumbers putty to no success.

Installed new bathroom faucet and drain. After installing water is leaking underneath
from the drain. Have reinstalled and used plumbers putty to no sucess.

Where, exactly, does the leak show up?(see image) At the base where the nut tightens the gasket? Does it leak with the stopper closed. Fill the bowl, close the stopper and tell me if it still leaks. Cheers, Tom,

Tom,
It is leaking where the assembly meets the sink underneath.

Tom,
It is leaking where the assembly meets the sink underneath.
And this still leaks with a bowl full of water and the stopper closed? Do this and get back with the results. What I'm attempting to find out is whether you have a leak at the drain lip or at the gasket where you see the water.
Let me know. Tom

Since the original posted never continued his question, I am having this same problem Tom. I installed a new faucet and drain and it is leaking when the water is running, not when the bowl is filled and stopped. Although, when the bowl is stopped, I can hear a trickle of water going down the drain.
Thanks!

Where, exactly is then leak? When you run the faucet? Like an pressure leak?
Or is it a drainage leak like the first poster had? Please explain with more details. Back to you, Tom

It is a drainage leak like the first poster had. I just took the faucet out and we are returning it to Lowe's for a different reason. The pull stop is not working with our backsplash setup. There is no room to pull it. I will install the new one and hope for better results. Should I be putting teflon tape on ever single threaded connection?

It's a good idea to tape all threaded joints. Let me know hoe the new waste works out for you. Good luck, Tom

Hi Tom,
New faucet, same issue! The water comes from above the rubber gasket underneath the counter top. Could it be because in order to connect to the drain pipe from my wall, I had to pull the whole assembly forward a bit? I bought an extension piece because this vanity is 3 in. taller than my old one, should I have picked up one of those "J" pipes that extends?
Thanks!
--Jeff