Funny this should come up now. Back when I was winterizing I had removed the hose from the faucet set to do whatever it was I thought I had to do at the time. ??? A while later when pumping anti-freeze through everything, I realized the shower faucet leaked very badly right where the hose connected and I assumed I had left out a washer or something. I looked, but didn't see anything that I thought might cause the leak. But, with winter coming on, I needed to finish the winterizing so I decided I would wait and work on it this spring - which I just did. I still didn't see anything so I went to town to buy a new faucet (not a quick thing to do where I live). After coming up dry at 2 separate RV centers, I wound up ordering a new faucet on-line. My showers on my upcoming camping trip would have to wait until later. Today, while I was finishing up dewinterizing, I decided to flush the anti-freeze out of the shower and clean the shower stall even thought the faucet leaked badly. But, I remembered this thread. Well, for Pete's sake. The part of the faucet where the hose connects also serves as a siphon or vacuum break. There is a little rubber flapper-like insert that is supposed to let water in and block the drain hole when there is water pressure. Then it opens another hole when water pressure is removed to break the vacuum. However, the rubber insert was not and would not stay in place. Oh well, I have a new faucet on order... So, I continued to clean the shower. Upon moving the shower curtain, there it was. A little nylon insert that was supposed to hold the rubber flapper in place, hidden all this time by the shower curtain. I put the darned thing back together correctly this time and all is well. This thread made me look a bit closer and solve the problem. Guess I'll just have a spare shower faucet.