This Extension Kit is used to extend deeper installation of ceramic pressure balance valve within the wall. The Danze is focused on creating products that are an expression of their customers and their relentless search for something beautiful, distinctive and refreshing. Solid brass construction Provides 7/8" of extension beyond standard rough-in For 3/4" thermostatic valve IAPMO/UPC listed Use with 562 trim only. 16.6 GPM @ 45 PSI. 3/4" FPI Inlets and Outlets. Integrated check valves and screwdriver stops. Meets requirements of ASSE 1016 - 2005. Requires separate volume control.