You are Buying a Brand New And Factory Sealed Taco 329-T3 Cast Iron 1/2-Inch FPT x 1/2-Inch FPT Pressure Reducing Valve... Taco 1/2 in. Feed Valve is compatible with Taco models. This HVAC part serves as a water feed valve for a hot-water heating application. Water feed valve for a hot-water heating system. Compatible with Taco models, 1/2 in. connection