Features: Premium solid brass construction with integrated 304 stainless steel check valves ensures outstanding corrosion resistance and leak proof performances for water heater safety valves. Features automatic pressure relief technology to prevent tank overpressure and 360° anti backflow protection for enhances system security in demanding environments. Ideal for homeowners, professional plumbers, and facility managers requiring reliable overpressure protection in residential/commercial water heating systems. Safeguards electric water heaters in apartments, hotels, and commercial buildings against sudden pressure spikes and reverse water flows risks. Heavy duty brass body exceeds ANSI standards for thermal stability, while accuracy engineered stainless steel components ensure decades of maintenance free operation. Specifications: Material: 304 stainless steel+ brass Height: about 4CM/2inch Inner diameter: 2CM/1inch Outer diameter: 2CM/1inch Package Includes: 1xSafety 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.