【High Quality Material】Our solar water heater pressure relief valve is made of high quality brass, the interior is cast with high precision parts, and the drain mechanism is stable and reliable. 【Automation Design】When the system is running on water or the system pressure is too high and a complete drain is required, this automatic pressure relief valve can work reliably. As long as there is a pressure difference between the inside and outside of the system, the flush valve will continue to flush. 【Easy to Disassemble】To ensure that there is no water leakage. Will not flow during the discharge process Our automatic flush valve uses a special structure that uses the design of a steam and water separation bowl. Easy disassembly and repair, so there is no need to drain the system. Scope of delivery: 2 automatic heating vent valves with DN15 thread made of brass - Dimensions: 68.8 x 45 mm - Pressure level: PN1.6 - Remove excess air during operation of the exhaust system and the HVAC