Half Off Ponds - PA-RP60P - Subsurface Rocking Piston Aeration Compressor for Ponds and Lakes. Half Off Ponds PA-RP60P Subsurface Rocking Piston Aeration Compressors are high flow high capacity air compressors ideally suited for lake and pond bottom aeration. Half Off Ponds Air Compressors operate on a 120-volt 3.5-amp motor with a 6-foot double insulated power cord and are efficient in 25-foot water depths with a maximum operating depth of 40 feet. Air filter with replaceable debris-trapping element delivers clean pure air. These reliable low maintenance units are designed for continuous or intermittent operation. Sealed connecting rod and bearing lubrication oil-free air compressing chamber and shock absorbing vibration isolating mounts assure years of trouble-free operation. The Half Off Ponds PA-RP60P Subsurface Rocking Piston Aeration Compressor is used to help break down fish waste allowing natural gasses to harmlessly escape as well as helping prevent the pond surface fro