Barb Size: 5/8” (16mm). Work Temperature: -20-150. Work Pressure: 1.6Mpa. Barb Size: 3/4” (19mm). Work Temperature: -20-150. Work Pressure: 1.6Mpa. 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.) The 4-way automobile heater valve provides 2 modes of manual control. Close the valve in winter to allow the water cycle to proceed normally, meaning the water can flow from the engine compartment to the cab and pass through the heater. Open the valve in summer to stop the water cycle, improving driving experience. The bypass valve features a solid full brass body and plated handle, offering high reliability and durability, heat resistance, and resistance to deformation. Suitable for high temperature coolant environments.