Product SpecificationBarb Size: 5/8” (16mm). Work Temperature: - 20-150. Work Pressure: 1.6Mpa. Product SpecificationBarb Size: 3/4” (19mm). Work Temperature: - 20-150. Work Pressure: 1.6Mpa. ApplicationIt is specially designed for automotive gas conditioning systems to improve efficiency and reduce consumption in hot weather conditions, this flexibility allows it to be used in a variety of automotive gas conditioning systems. (Please make sure the product is the right size for you before purchasing.) FunctionThe 4-way automobile heater valve provides 2 modes of manual control. Close the valve in winter to allow the water cycle to proceed normally, that is, the water cyclecan go from the engine compartment to the cab and pass through the heater. Open the valve in summer to stop the above-mentioned water cycle, Improved driving experience. High QualityThe bypass valve is made of solid full brass body and plated handle, High reliability and durability, high temperature resistant, not easy to deform, suitable for high temperature coolant environment.