I've never rebuilt one myself but I read in one of the forums about it. Tried a search and couldn't find it. Seems like it was as simple as replacing a seal or O-ring.

The supply hose can go to either valve conection.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.