GAST Rotary Vane Air Compressors \ 1/4hp - 3/4hp & 1hp Models AvailableRotary vane compressors are sometimes used in situations where the water in the pond is less than 15' deep and the air lines are relatively short. The larger 3 4hp and 1hp models put out a substantial volume of air where shallow ponds with multiple diffuser locations will benefit. Like piston compressors, these air compressors are oil less in design and engineered for continuous duty operation. One of the advantageous design features of this type of