Originally Posted by oregnelk
I have a 1979 Airstream and I need to replace the Fresh Water drain tank (male threads) to the tank. The old plug was roughly 1.5 to 2 inches in diameter. Any suggestions on where to find one.
Are you talking about the big one that goes in the bottom of the tank and not on the side?
It's probably either 1-1/4 or 1-1/2 mpt. I found replacement for mine at tractor supply on the tank fitting section, pretty sure mine was 1-1/4.
Unfortunately it was shaped like a cup which means it would always hold water. I was worried about water in it freezing and cracking the tank so I drilled a small hole in the middle, put a stainless screw up through the bottom and filled the cup with melted (non toxic) hot glue. I made the large amount of hot glue by melting it in a container in a 400F oven and pouring into the plug.