The Check Valve is made from ABS materials that are specifically chosen for their resistance to and water. This ensures that the valve remains in excellent condition even after prolonged use. Its multi-functional design allows it to be used as -way valve, a water stop valve, or a backflow preventer, catering to different requirements. Features -Color:Red -Material:ABS -Size:5.00X1.40X1.40cm/1.97X0.55X0.55in -Tip hole diameter: 4.5mm - Protect your fish tanks air pump by preventing the aquarium water from anti-siphoning during power outages. - You will receive enough aquarium check valves, small and compact. It's easy to install. - Efficient and practical, fast and convenient, can protect your air pump, convenient to use. - Can prevent the reduction of pressure caused by aquarium backflow, to maintain the function of bottle and service life. - Great one way non-return check valves for fish tanks air pump or fish tanks air pump. Package list: 10 tank valve