Complete aeration system for ponds up to three acres depending on shape and depth of pond. 1/2 hp Rocking Piston SRC50 compressor, 4.5 cfm, 3.6 amps, aerates up to 50′ deep. The PA66W kit also includes three QS2 Quick Sink air diffusers, three valved outlet assembly with pressure relief valve, 300′ of 3/8″ Quick Sink tubing, fittings and clamps. This system will effectively aerate: 3/4 Acre Pond at 5'-8' Deep 1.5 Acre Pond at 8'-12' Deep 3 Acre Pond at 12'-16' Deep PA66W (No Cabinet) features: 1/2 hp Stratus SRC50 Gen 2 compressor with two year warranty Three valve manifold with pressure relief Valved outlet with heat reducing hose and 3/8″ connections Three QS2 Quick Sink self weighted dual head air diffusers 300′ 3/8″ Quick Sink weighted tubing Approximately 1.5 cfm of air flow per diffuser Typical operation cost of $0.86 per 24 hours at .09¢ per kWh, actual cost may vary PA66W requires weather protection for the compressor (Available for purchase with cabinet, or without. If you choose the system without cabinet, you will need to provide your own protective housing to shield the compressor from the weather.) 2-Year Warranty on Compressor, 5-Year Warranty on Tubing and Diffuser PA66D Sentinel Deluxe System (Ground Cabinet) features: SRC50SS Stratus™ SRC 1/2 hp Air Compressor with Sound Shield™ pre-installed SC22 Deluxe 22″ Ground Mount Locking Cabinet Cabinet hardware Noise reducing foam pre-installed Valved outlet assembly pre-installed Pressure gauge pre-installed Pressure relief valve pre-installed Cooling fan pre-installed Electrical box/outlet pre-installed and ready for your incoming power line Heat reducing hose and 3/8″ connections Three QS2 QuickSink Weighted Diffusers (dual head) – Approx. 2.2 cfm air flow per diffuser 300′ of 3/8″ QuickSink weighted tubing with fittings for connections Typical operation cost of $0.86 per 24 hours at .09¢ per kWh, actual cost may vary 2-Year Warranty on Compressor, 5-Year Warranty on Tubing, Diffusers and Cabinet. PA66DP Sentinel Deluxe System (Post Mount OR Ground Mount Cabinet) features: SRC50SS Stratus™ SRC 1/2 hp Air Compressor with Sound Shield™ pre-installed SC18 Deluxe 18″ Locking Cabinet that can be post or ground mounted – with noise reducing foam pre-installed Cabinet hardware for either post mounted OR ground mounted cabinet placement! Valved outlet assembly pre-installed Pressure gauge pre-installed Pressure relief valve pre-installed Cooling fan pre-installed Electrical box/outlet pre-installed and ready for your incoming power line Heat reducing hose and 3/8″ connections Three QS2 QuickSink Weighted Diffusers (dual head) – Approx. 2.2 cfm air flow per diffuser 300′ of 3/8″ QuickSink weighted tubing with fittings for connections Typical operation cost of $0.86 per 24 hours at .09¢ per kWh, actual cost may vary 2-Year Warranty on Compressor, 5-Year Warranty on Tubing, Diffusers and Cabinet.