Is a Grohe rough in box needed or just the PBV?

[Jechow]

I would like to install a new shower fixture. Do I need to purchase both the Groflex universal rough-in box (35026000) and Grohsafe PBV (3501500)? I planning to install the Parkfield shower (3503900) which I assume comes with neither of the above.

Thanks
Jason

 

[CountryBumkin]

Do you have a link the products?

 

[Sponsor]

 

[Jechow]

Hi CoutryBumkin

For the rough-in box
http://www.grohe.com/us/5750/search...roduct=35026-G294&color=000&material=35026000

For the Grohsafe PBV, I couldn't find the link in Grohe's website so I provided this link
http://www.homedepot.com/p/GROHE-Pbv-Rough-in-Valve-in-Chrome-35-015-000/100685430

For the Parkfield shower,
http://www.grohe.com/us/21322/bathr...roduct=35039-G359&color=000&material=35039000

Thanks

 

[CountryBumkin]

I don't see any need for the rough-in box as long as you are using ridged pipe (not PEX) so you can properly support and position the valve. What do the installation instructions say?
Disclaimer: I'm not a professional plumber and I have not used that Grohsafe product.

 

[Jechow]

I was thinking the same after taking a look at the setup I am looking to replace. I haven't purchased the PBV yet so I don't know. Thanks again.

 

[CountryBumkin]

based on the specs I read here http://d3unq1hljpybmw.cloudfront.net/tpi/1000/1500/1560/1564/1564322/original/1564322.pdf the rough in box is not needed (it's not even mentioned).

 

[DougB]

It doesn't look like you need the rough-in box.

The Grohe thermostatic shower valve that I purchased needed one. Valves that use the rough-in box have no pipe connections. They are connected to the 'base plate' in the back of the box.

The nice thing about the rough-in box - is that you can completely waterproof it, and you can replace the entire valve body without disturbing the tile.