OWS AerMaster Pro 9 - Deep Pond Electric AeratorOutdoor Water Solutions AerMaster Pro 9 is a 3 4 HP Electric Aerator This system is great for ponds up to 1 1 2 acres. It works great for ponds up to 40 ft deep. AerMaster Pro 9 includes: 3 4 HP Rocking Piston Compressor Circulating Fans 3 Valve Manifold with 3 Adjustable Valves 500 ft of 1 2" weighted airline 3 Air Double Disc Diffusers with Self Sinking Bases 1 Pressure Relief Valve 1 Oil Filled Pressure Gauge Powder Coated Aluminum Cabinet