Built in 1 way check valves blocks cold water backflow while 0.5 " threads with silicone gasket enable tool easy installation without sealant tape Premium 0.8MPa brass valves automatically releases excess pressure to water heater explosions, featuring erosion resistant construction with silicone seals for 6 pressure resistance, this full copper valves assembly comes with 1 meter clear hose for visual flows during operate 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 thresholds, Manufacturer: DEKKRYNFV