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This specially designed 0.31" (five-sixteenths inch) Active Aqua Check Valve will safeguard your air pump by preventing nutrient solution from back-siphoning and entering it in the event of a power outage. Simply place the check valve in your run of five-sixteenths inch air line tubing between your air pump and reservoir or hydroponic bucket, and you will never worry about solution returning down the air line and damaging your pump. 

  • For pumps that use five-sixteenths inch air tubing
  • Compatible with air pump model AAPA45L
  • Pack of six check valves