Features 1、The one-way check valve is made of PVDF (polyvinylidene fluoride) material, which is strong, wear-resistant and durable 2、The check valve nozzle is designed with a pagoda-shaped slot, which is non-slip, non-toxic, airtight, and has good adsorption performance 3、The one-way check valve is easy to install, convenient for you to unscrew and replace 4、Normal performance at 25℃～60℃, strong resistance to acid, alkali and salt corrosion 5、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 air Specification Item Type: Check Valve Shell: PVDF (Polyvinylidene Fluoride) Tightness: For VITON Fluorine Rubber Diaphragm 1/8 Inch: Usually Suitable for Soft Hoses with an Inner Diameter of Approx. 3-3.5 mm / 0.12-0.13in 3/16 Inch: Usually Suitable for Soft Hose with Inner Diameter of Approx.4-5 mm / 0.15-0.2in 1/4 Inch: Usually Suitable for Soft Rubber Tubes with an Inner Diameter of Approx. 6-7 mm / 0.2-0.3in Package List 1 x Check Valve