I've just installed a single handled Pegasus shower valve ( I know, I know...). When I turn it on water comes out of the shower head as well as the spout. Any ideas as to why this is happening and how to fix? Oh! the reason I replaced the whole thing is because the fixture I had before did the same thing.
The CPVC is the problem and if the old one was done the same way it was the problem with it also.
Where is the leak coming from¿ The catridge or where CPVC meets valve¿ Did you use teflon tape and or pipe dope¿
I just post cuz I like to see my avatar.
Is the smaller ID of the CPVC causing the problem? Should I replace with 1/2 inch PVC or galvanized pipe. Manufacturer's specs are 8 inch minimum space between valve and spout. Could that be the problem? Kingsotall, it's not a leak, just when I turn on the water it comes out of the shower head and the spout before I pull up the spout shut off (or whatever you call it). When I do that the shower works just fine, no leaks anywhere.
Make the pipe between the valve and the spout copper, and your problem should go away. Don't even think about galvanized unless you like rusty bathwater.
Important note - I'm not a pro
Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013
Apparrently you did not read the fine print in the instructions where is said "copper only" for the drop to the shout, no CPVC and no PEX. Also, the length of the drop is important.
6" or 8" it is immaterial. The recommended distance is to insure that the trim plate does impact the spout, so if 6" works that is fine.