Grohtherm Thermostat Rough-In 3/4 in Valve Parafin Cartridge Built-In Check Valves Temperature Control Only NPT 18 gpm at 45 PSI 3/4 in valve Must use with separate volume control Please note requires Twin Ell for shower/tub combinations with diverter spout - Buy Now or get More Info on Grohe Bath - Click Here To Order