Features: Premium 0.8MPa brass safety valves automatically releases excess pressure to prevent water heater explosions, featuring erosion resistant construction with silicone seals. Built in 1 way check valves blocks cold water backflow while 0.5" threads with silicone gasket enable tool easy installation without sealant tape. Ideal for homeowners, plumbers, and facility managers maintaining residential/commercial water heaters or upgrading aging valves systems. Safeguards tanks type water heaters in apartments, industrial pipelines, and heating systems from pressure surges exceeding safety thresholds. for 6 pressure resistance, this full copper valves assembly comes with 1 meter clear hose for visual flows monitoring during operate . Specifications: Component : brass Size: about 4.3x6cm/1.69x2.36inch Package Includes: 1xPressure Relief valves note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.