Long story short it is unacceptable.
Can i use pex for tub spout.
Copper is the only professional installation material.
Pex when you pull up on the diverter the entire spout moves.
With a built in diverter you could use a pex drop eared ninety degree female adapter and a nipple but that is more trouble than it is worth.
These spouts will work with just a clean open copper pipe as it has a set screw adapter to clamp the pipe.
It is only created on tub spouts where a diverter closes off the easier path out the tub spout to send it to the shower.
The interior diameter of pex is actually a fraction smaller than copper this forces water to come out of the shower at the same time as the tub spout.
Ironranger mn i m pretty sure what they meant was that if you use 1 2 pex you could have a restriction since it s smaller than copper.
2nd reason pex is flexible and the spout relies on the pipe for support.
2 reasons i learned.
You cannot use pex because the pipe coming out of the valve needs to be able to support the weight of the tub spout and handle the abuse of pulling pushing down of the divirter built into the spout.
The tub spout can be copper brass or galvanized pipe.
After investigating the 3 4 will work just fine no restrictions.
Pex to tub spout.
When pex is used on those tub spouts the excessive back pressure sends water up the shower.
There is no way to secure pex adequately to keep a tub spout from flopping around.