Caleffi 1" sweat, with inlet check valve, adjustable thermostatic and pressure balanced mixing valve for point of distribution in domestic water systems and radiant hydronic heating systems. Low-lead brass body and ttings.. Locking set point knob. Min flow for optimum performance: 1.3 gpm. Meets requirements of ANSI/NSF 372-2011. 3 CV, adjustable from 85f to 150f.