Fitment--This shower extension set is compatible with Grohtherm SmartControl and SmartControl Mixer Trims sets for final installation with up to three functions in combination with Rapido SmartBox and replaces for grohe 14048000 universal extension set. Function--To install this extension set let to control your shower or bath flexibly and cleverly. Size--Provides a 1-Inch extension between Rough-In and Trim, for 25mm. Material--Made of high quality materials with durable and sturdy performance, great fitment for your shower control box with with 3 functions. .