Sentinel Deluxe 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. PA66ADP kit includes compressor, three valve outlet assembly, pressure gauge and pressure relief valve all mounted in SC18 Post Mount or Ground Mount lockable steel cabinet with cooling fan and electrical outlet installed. Kit includes three QS2 Quick Sink air diffusers and fittings for connections. Kit does not include tubing, making it an ideal solution where custom tubing lengths can be purchased as needed. Connections are set up for 3/8″ ID tubing.