After I got through replacing the panels in my bathtub/shower walls, I had ordered a new faucet. Of course the old faucet has the shower spud that leads to a hose for the shower head.
We had never used the shower/tub system to know if anything worked in this area in the couple years we had TT.
Well, when I went to change the shower hose line to the new faucet, I blew into the hose line to be sure line was clear. DID NOT FLOW with any air.
I removed the hose from the showerhead and blew from that end. All the air escaped like it should as if water would flow.
I had just found that the hose had a 1-way valve on the end.
Remove the shower hose from faucet and blow air into it to see if air escapes out the showerhead. If not flip the hose around as someone put the hose on backwards, as it too may have a 1-way valve.
Del & Jerre w/Isis our English Bull Terrier
The Cougar's Den
1984 Fleetwood Prowler "E"