5 Pcs One Way Non-Return Check for Valve Air Pump Check Valves Fish for Tank Stop for Valve for Aquariums Hydroponics

To prevent water backflow to damage the front end of the pump or other products and equipment. After the addition of the stop for valve, the pump can be placed above or below the of the water to prevent the risk of water backflow when the pump is shut off. Each outlet needs to connect a stop for valve, two-headed pump needs two stop valves, and so on. 5 Pcs One Way Non-Return Check for Valve Air Pump Check Valves Fish for Tank Stop for Valve for Aquariums, Hydroponics, Features: brand new and high quality To prevent water backflow to damage the front end of the pump or other products and equipment. After the addition of the stop for valve, the pump can be placed above or below the of the water to prevent the risk of water backflow when the pump is shut off. Each outlet needs to connect a stop for valve, two-headed pump needs two stop valves, and so on. Note: Please be sure to connect the end with OUT to the end near the air stone. Package Content: 5x one-way check valves. Specification