BAI 0109 Concealed Shower Mixer With Water Pressure Balance Valve 2-3 Functions (Round Knobs) Delivers precise, consistent temperature control and a generous flow rate Pressure balance valve allows user to set and maintain precise temperature One diverter with up 2 - 3 functions, laser printed details Designed to fit into standard 3.5" frame wall Concealed brass body construction, stainless steel faceplate