[Georgeb]

About 3 weeks ago our coach had an air regulator start leaking. This regulator 
Is in the wet bay on the curb side. I think it supplied air to the bath area. I replaced it and all was good!! 
Now we have a new leak. It’s also a regulator!
This one is on the drivers side under the kitchen area. To What does this regulator supply air?
At What pressure should it be set?

[Richard]

Hard to say, all Newells are different.

What doesn't work when this line is capped?

[Georgeb]

I’ll cap it off in the morning and report

[Georgeb]

Regulator supplies air to seat
I set the new one to 40 lbs