Still no sink, but another thing I just thought of....it's a single valve bypass do guessing that's why there's a check valve? All I know is when you look in the hot water supply coming out of the wh, you see a white plastic disk.
Hmmm. Looks like we need to pull the fitting and see about replacing out...er ahh, guess my buddy can figure it out from here cause I'm going camping! Friends are friends, but were talking camping.
Joel