811CFM 5.5HP Double Stage Air Compressor Pump Head 175PSI Twin Cylinder? 340mm Features: High efficiency, high precision, universal, low energy consumption. High quality material, not easy to damage. Strict balance support and correction to ensure the smooth operation of the main engine. Special valve steel is used for hair piece, which has good strength and toughness at high temperature. Faster inflation and low noise. Strong cooling blade, good cooling performance.