Feature:1. The one-way check valve is made of PVDF (polyvinylidene fluoride) material, which is strong, wear-resistant and durable2. The check valve nozzle is designed with a pagoda-shaped slot, which is non-slip, non-toxic, airtight, and has good adsorption performance3. The one-way check valve is easy to install, convenient for you to unscrew and replace4. Normal performance at 2560, strong resistance to acid, alkali and salt corrosion5. Widely used in auto parts, machinery industry, household appliances, agriculture, etc.Check valve is suitable for fluid system to prevent backflow of liquid, or for pneumatic system to prevent backflow of compressed airSpecification:Item Type: Check ValveShell: PVDF (Polyvinylidene Fluoride)Tightness: For VITON Fluorine Rubber Diaphragm1 or 8 Inch: Usually Suitable for Soft Hoses with an Inner Diameter of Approx. 3-3.5 mm or 0.12-0.13in3 or 16 Inch: Usually Suitable for Soft Hose with Inner Diameter of Approx.4-5 mm or 0.15-0.2in1 or 4 Inch: Usually Suitable for Soft Rubber Tubes with an Inner Diameter of Approx. 6-7 mm or 0.2-0.3in.Package List:1 x Check Valve