Originally Posted by Mike S.
The brass valve is a water drain for the plumbing system, not the tank. The white valve drains the tank. I broke the brass valve while my trailer was sitting in my shop trying to figure out what is was for. Had a hose hooked up to the water supply and turned the valve. Water came out and the valve broke off. The 90 fittings have a thin wall and are easy to break. It is a pita to fix, had to cut an access hole to gain access to the pex tubing. If it breaks, the brass fittings will just spin in the pex. I put a smaller valve, like that found on a car radiator, to reduce the chances of being hit, eliminating the 90 fittings. Hope this helps.
Originally Posted by 111
Nothing in the owners manual about the brass. Dealer doesn't know anything.
Thanks Mike for solving the mystery here. I believed you but thought it best that 111 confirm the diagnosis for HIS coach's valve.
Could you guys please comment on the left end of the valve being convex/bulbous to receive flared copper tubing, or is it NPT as wander-west suggests?