We have an old fiberglass one piece shower that has a dual valve setup that I would like to replace with a single unit. The currently installed unit does not have any anti-scalding features, so its time to upgrade it.

Currently the valves use the collars to attach the valve to the shower stall.

1) Are there recommendations for the type of shower valve I should replace this with and how should it be mounted?
2) Do I need to add blocking to attach the new unit?
3) Do any of the new valves attach similarly or is that a no-no these days?

Any input would be appreciated.

VB,

[www.amazon.com]


this is one possibility

Packy's suggestion is for the cover plate that will cover the holes left by removing the two separate valves. Without this, you'll be left with two holes in the fiberglass shower wall that are quite difficult to patch & finish with good results.

You will absolutely need to mount the valve and all three water lines to framing members. Other than guessing there are studs spaced 16" apart, nobody can predict what your mounting/blocking situation will be without opening up the wall. Are you able to access the valves from the back side? In an ideal world, that would be in a hidden location, like a closet, where you could replace the drywall with an access hatch.

If this is a mobile or manufactured home, even my guess about the studs may be wrong.