This specially designed 0.37" (three-eighths 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 three-eighths 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 three-eighths inch air tubing
• Compatible with air pump models AAPA70L and AAPA110L
• Pack of six check valves