The Gast 0523 Rotary vane septic air pump is a highly reliable septic aerator designed for years of service. Using 115v 1/4 H.P motor and producing 4.0 C.F.M of air at a maximum 10psi. 0523 from Gast can be used in aerobic septic systems from 500G.P.D to 1000 G.P.D. or ponds up to 1 acre in size.The 0523 offers more consistent air flow over a diaphragm or piston pump and normally a longer life as well. these aerators can be rebuilt many times when the vanes wear down and no longer work. They have a built in thermal protection on the motor as well.