1、This inline check valve allow the liquid or air to stream in one direction, thus preventing backward stream. 2、The check value widely used in many industry applications including fuel pumps, household appliances, agriculture equipment, etc. 3、This one-way check valve is made of plastic material, safe, non-toxic and anti-rust. 4、The plastic check valve is easy to install, convenient for you to unscrew and replace. 5、This check valves are applicable for fluid systems to prevent countercurrent liquids. Specifications - Condition: 100% new - Color: White - Material: Plastic - Hose Size: 4mm / 6mm / 8mm / 12mm - Opening Pressure: >0.015MPA - Compatible: Suitable for water, petrol, oils and other fluids Note: Please allow 3-5 mm error due to manual measurement Package Included: 1 x 1-Way check valve