I am installing a new bathroom sink and it is leaking in two parts, at the faucet drain and at the p-trap. I will ask separate questions for each of these as I believe it is a different solution at both sites (where its leaking). This is all 1 1/4" plumbing. Here I will ask about the faucet drain leak.
The installation looks like this:
The instructions for installing the faucet drain are here:
As you can see, the instructions want you to:
- Place the drain in the sink, so that its tailpiece is descending down into the vanity below the sink; then
- Thread the conical washer over the tailpiece into place right up against the bottom of the sink, pointing "up" (smaller end of the conical washer facing upwards); then
- Thread the flat washer into place, just below the conical washer; then
- Screw the thick black nut into place firmly, just below the flat washer, and effectively binding the faucet drain to the sink
This is how I installed it, and it is leaking with this configuration:
One important thing to note is that the YouTube video does not show the flat washer being used at all!
I have made sure everything is tightly fit/snug. Can anyone spot why its leaking, if I'm installing it incorrectly, or whether I'm using the flat washer incorrectly?