The PS20 Airmax Aerator is a 1/3 hp dual diffuser aerator. Included are two ProAir4 Weighted Diffusers, Silent Air Cabinet with cooling fan, pressure gauge, pressure relief valve and 200' of EasySet Self-Weighted 3/8" Airline. Aerates ponds from 1/2 acre (6' - 9' deep) to 2 acres (12'+ deep).