On Sat, 01 Jun 2019 21:44:02 GMT, Mitchell Broussard
m wrote:

replying to forum111, Mitchell Broussard wrote:
I recently gutted and remodeled a house on Toledo Bend. We tied in to a PVC
3/4'' line and reduced it down to 1/2'' Pex feeding the Hot water heater, BIG
MISTAKE!! No Volume, sure the toilets and Vanities work fine but the Shower
/tub doesnt. The problem i have now is everything is behind new drywall, and
hot water heater is in attic. We have been troubleshooting the water volume
problem and after reading all your comments, i know the problem is my incoming
line (too small). I'm either gonna go with 3/4'' PVC or hopefully i can get by
with 3/4'' PEX and use the Manifolds they sell like at Lowes, right????

PEX has the same problem as CPVC has. The nominal OD size is the same
as copper pipe but the wall thickness is a lot thicker so the ID is
smaller.