Determining valve size for shower control

[Max]

Hi, Folks.

My wife is trying to buy new volume / heat controls for the shower (we're having it ripped out and a new one put in). We are responsible for buying all the materials. She is looking online at various fixtures and there are choices for sizes - 1/2" and 3/4". I believe that 1/2" is the most common but how I do know for sure what to get without ripping the current fixtures out? Is it as simple as removing the pipe that attaches to the shower head and using that as a guide?

Thanks, Max

[Redwood]

More than likely you have 1/2" supplies to the mixer.
You would open the wall to tell for sure.

The 3/4" ones tend to be newer high performance multiple head shower systems.

[Max]

Thanks for the reply!

The wall will be getting ripped out but I was hoping there might be a way to tell before we get to that stage.

I'm going to assume it's 1/2" since that is the most common. If my wife wants a unit that has both sizes then I think we will buy one of each and return the one that doesn't fit.

Cheers, Max