Premium brass construction with integrated 304 stainless steel check valves ensures outstanding erosion resistance and leak proof for water heater valves Safeguards electric water heaters in apartments, hotels, and commercial buildings against sudden pressure spikes and reverse water flows risks Features automatic pressure relief technology to tanks overpressure and 360 degree anti backflow defense for enhances systems security in demanding environments Ideal for homeowners, professional plumbers, and facility managers requiring stable overpressure defense in residential / commercial water heating systems Heavy duty brass body exceeds ANSI standards for thermal stability, while accuracy engineered stainless steel components secure decades of maintenance without operate, Manufacturer: JDNH