Manufacturer Name: Caleffi Product Number: 521519A OEM Part Number: 521519A Product Description: 3Wtherm Mixing Valve 3/4"Swt Weight:2.68lbs/1215.63g The Caleffi 521519A 3-Way Thermostatic Mixing Valve is used to mix cold and hot water to provide a stable and safe outlet temperature for different applications with emphasis on HVAC systems. This 3/4” sweat valve wo... https://www.partshnc.com/521519a-caleffi-3wtherm-mixing-valve-34-swt