Feature 1This inline check valve allow the liquid or air to stream in one direction, thus preventing backward stream. 2The check value widely used in many industry applications including fuel pumps, household appliances, agriculture equipment, etc. 3This one-way check valve is made of plastic material, safe, non-toxic and anti-rust. 4The plastic check valve is easy to install, convenient for you to unscrew and replace. 5This 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, gas air Note: Please allow 3-5 mm error due to manual measurement Package Included: 1 x 1-Way check valve .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }