The GrohSafe 3.0 Shower Rough-in Valve is engineered for quick, easy installations no matter the situation. A compact body allows for a hassle-free fit even in tight spaces. Flatback ensures solid mounting on a standard cross brace, and installation on thin walls or steel is sturdy and secure. Made of DZR brass to resist corrosion, the GrohSafe 3.0 is equipped with a flush plug that allows you to test and flush lines with ease. The stainless steel fixation ring keeps the flush plug and cartridge in place without screws. The cartridge is sold separately.