The Spindrifter Direct Air Feed kit makes it easy to keep the 1" airline free of stagnant water. 

The kit includes a PVC Pressure bung for inside the Spindrifter Drain sump, with a barbed hosetail for flexible airline to connect to the diffuser. The 1" PVC socket and barbed hosetail is used above the water line to connect the 1" airline pipe to your air pump or manifold.