Anyone know the correct size?
https://www.mcmaster.com/dowty-washers/
It looks to be 5/8 ish but I have constant leakage. Looks like someone buggered the threads at some point and clean out the treads and semi-countersunk and removed about 1/4" of the threads.
I think that is why I have a constant leak.
Any alternative ways of sealing it?