I’m trying to fit a tank boss to a motorhome waste water tank.
Eg.
The boss comes with a rather soft rubber washer that I assumed went under the nut on the outside, but as soon as I started tightening the nut, it just “oozed” out from behind the nut. Perhaps it should go on the inside?
Anyhow, I tried just tightening it all up without the washer but there’s a slow leak around the fitting.
Should I
a) try it with the washer on the inside?
b) try it with the washer on the outside and just resist the temptation to over-tighten?
c) try it with a different/harder rubber washer?
d) slather it all in some sort of sealant before tightening it up?
or something else?
Tim