Air Pump Check Valves Material: SUS304 Stainless Steel:Crafted from high-grade SUS304 stainless steel, ensuring durability and resistance to corrosion. Scope of application: Vacuum pumps, molecular pumps, negative pressure equipment:Versatile design suitable for a range of vacuum systems, from pumps to negative pressure equipment. Performance and property: 304 Stainless Steel Vacuum Check Valve:High-performance 304 stainless steel check valve for reliable vacuum retention in your applications., Manufacturer: DKGNYXNPLJ