2nd reason pex is flexible and the spout relies on the pipe for support.
Can i use pex for tub spout.
There is no way to secure pex adequately to keep a tub spout from flopping around.
Pex when you pull up on the diverter the entire spout moves.
2 reasons i learned.
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.
Copper keeps the spout in place.
Long story short it is unacceptable.
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.
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.
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.
These spouts will work with just a clean open copper pipe as it has a set screw adapter to clamp the pipe.
After investigating the 3 4 will work just fine no restrictions.
Pax has a smaller inside diameter than copper when you will turn on the spout your showerhead will also be dripping if you read the manufacture instructions it will say do not use pex for spout level 2.
Copper is the only professional installation material.
Pex to tub spout.
The tub spout can be copper brass or galvanized pipe.