Aspen Aeration 3/4th Hp Complete Aeration Kits3 4 HP Rocking Piston Compressor double head with air filter for aerating ponds up to 4 acres. Includes 4 100 ft 3 8" self weighted air hose that is stronger, thicker and heavier than other brands and can handle freezing temperatures Includes a 4 way heavy duty manifold with an oil filled pressure gauge to reduce indicator vibration and anattached is a pressure relief valve which opens at approximately 25 psi to prevent damage to the compressor The 4