THOUGHTFUL DESIGN: German design and engineering delivers exceptional performance for all of your shower needsFUNCTIONALITY: Provides a sleek solution to connect your hand shower hose and is 2.4-inches in diameterPREMIUM FINISH: Mounts flush to shower wall via 1/2-inch NPT female inlet and works best with hangrohe Techniflex premium shower hosesBACKFLOW PREVENTION: Double check valve design to protect against water backflowINSTALLATION: First all 1/2-inch shower hoses, 1/2-inch nipple needs to stick out about 5/8-inch from the wallINSTALLATION NOTES: Hansgrohe recommends a licensed plumber install this productLIMITED LIFETIME CONSUMER WARRANTY: All hansgrohe products are covered by a limited manufacturer warranty applicable to the original purchaser