I have been fighting a faucet leak in the bath room for awhile - I pulled off the lines and checked the washers - looked ok so I put a little sealer on and re installed - ok for awhile then a drip again so I bought new washers and leak gone again. yesterday leak was back - This time I removed the faucet so I could check the area where the seal is and found a tiny pin hole at the top of the tube leading to the connection - water ran down the copper tube and looked like it was leaking at the connection. Guess thats what makes it fun