Sentinel Deluxe Aeration System for ponds up to four acres depending on shape and depth of pond. 3/4″hp Rotary Vane RV75 compressor, 10 cfm, 12 amps, aerates up to 18′ deep. PA75ADLD kit includes compressor, four valve outlet assembly, pressure gauge and pressure relief valve all mounted in SC22 lockable steel cabinet with cooling fan and electrical outlet installed. Kit does not include tubing or diffusers making it an ideal solution where custom tubing lengths and choice of diffusers can be purchased as needed. Connections are set up for 1/2″ ID tubing.