Description If you are looking for a professional and affordable check valve, then your research is over here. That's because our product can meet your need. Adopted of premium material, it is practical and durable for long time use. It is not easy to get deformed and bring you much convenience. Features -Color:Transparent -Material:PP -Size:3.80X1.50X1.50cm/1.49X0.59X0.59in Suitable hose: 4mm inner diameter Temperature resistance: 100 Opening pressure: 0.005MPA (0.05kg water pressure) Reverse back pressure: 0.7MPA (7kg water pressure) - The interior is designed with a non-slip card slot, which has strong adsorption performance and prevents falling off. - Suitable for preventing backflow of liquid in fluid systems, or for preventing backflow of compressed air in pneumatic systems. - Plastic barb fittings made of high grade PP material, not easy to crack. - Outstanding workmanship, reasonable design, stable and practical, will bring you a good using experience. - Fine workmanship, durable and sturdy, not easy to wear or tear, you deserve to have one. Packing list: 6 x check valves