Features: The dimensions are 1/2inch male thread and 1/2inch female thread. Brass safety valves automatically releases excess pressure to prevent water heater explosions. Make of brass, has a highly density, is strong and enduring and has a high resistance to mechanical damage and wear and tear. Our brass safety valves has the function of both a check valves and a pressure relief valves. On the a hand, it is a check valves that prevents the hot water from flowing back from the boiler into the cold water circuit. If, on the other hand, the pressure in the boiler rises on the set value when heating water for any reason, the water heater pressure relief valves as a safety valves dissipates the required water, preventing serious disturbances and dangerously overpressure. The safety valves can be used both in a house and in an apartment as well as in most commercial rooms in areas such as industry, sanitary, heating. Specifications: Component: Brass maximums working pressure: 0.7MPa/0.75MPa/0.8MPa/0.85MPa/0.9MPa (optional) Working temperature: -20°C≤T≤110°C. Dimensions: 1/2inch external thread and 1/2inch internal thread Length: about 44mm/1.73inch Package Includes: 1pc Pressure Relief valves note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.