If the pressure is to high at the faucet creating back pressure and I turn down the water at the main water shut off, would that reduce the the pressure enough to stop the water from coming out the shower. I thought that would be the case but I was wrong and water still came out the shower head when filling the tub.
Question: If reducing the pressure there doesn't help then how much help would replacing the Pex line for copper be?
Can anyone she'd some light on my situation. I might add that there is a considerable amount of water coming from the shower head. The shower head mixer and faucet are Moen products
Best Answer
Sounds like you used PEX to run from the mixer valve to the tub spout. Replace the PEX that goes from the mixer to the spout with copper. You are getting a bypass to the shower because the PEX from the mixer to the spout cannot handle the flow without backing up to the shower head. PEX has a slightly smaller i.d. than copper.