[Optimize A/C & Heater Efficiency]By manually shutting off or opening the warm water circulation, this valve helps stop residual warm coolant from mixing into the cold air stream, especially in hot weather. This can enhance cooling performance inside the cab, reduce unnecessary engine heat load [All-Brass Construction]Built with an all solid brass body including brass ball core and brass stem, paired with an electroplated metal handle that is strong, , and wear‑. This design offers excellent high‑temperature resistance, resistance, and long service life in demanding coolant and heater environments. [Integrated Leak- Design]Adopts a fully integrated structure with no fixation points in the path, helping prevent water channeling and achieving a good sealing effect. For older vehicles with aged or less elastic hoses [Size & Performance]Features a 5/8" (16mm) OD barb connection compatible with most standard automotive heater hoses, supporting working temperatures from -20℃ to 150℃ and a maximum working pressure of 1.6Mpa, delivering reliable control for a wide range of vehicle cooling and heating systems. [Protect Heater Core & Engine]Directs warm water from the control valve to the cab's heater tank more precisely, reducing outside water intrusion and helping avoid dry‑running of the heater core. In cases where the heater tank is aged, cracked, or leaking, Weight: 1.14530145109 pounds, Manufacturer: Ehwisbe