In my downstairs bathroom sink the hot water supply line seems to be leaking. It's not the tubing, but rather at the connection where the tube attaches to the pipe. It seems to be right behind the shutoff valve at that connection. Any ideas on how to fix it correctly? Thanks in advance!

You could shut off the water and replace the shut off valve and all the associated o-rings for the tubing to the faucet. It's a cheap repair and use pipe dope or teflon to seal the threads from pipe to valve.

HelloTacmedic'

See the image below and please tell us where is your supply line leaking from, Thanks.

John