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Total length : 43mm/1.69 inch , Diameter : 10mm/0.39 inchOpening pressure: Less than or equal to 0.5 Kpa,Maximum back pressure: greater or equal to 0.3 MpaShell material: ABS resin, Diaphragm material: silicon rubberPerformance: Normal performance under 25 ℃ to 60 ℃, Strong resistance to acid, alkali, salt corrosion ability,Medical grade material, safe and nontoxic Application: check valves are used in a fluid system to prevent countercurrent fluid flow, or in a pneumatic system to prevent reverse flow of compressed air