181PSI 5.5HP 21CFM V Type. Twin Cylinder Air Compressor Pump Head Double Stage. 1181PSI 5.5HP 21CFM V Type Twin Cylinder Air Compressor Pump Head Double Stage. The item “US 5.5HP 21CFM 181PSI V Type Twin Cylinder Air Compressor Pump Head Double Stage” is in sale since Saturday, January 4, 2020. This item is in the category “Home & Garden\Tools & Workshop Equipment\Air Tools & Air Compressors\Air Compressors”. The seller is “wezha-84″ and is located in Tampa, Florida. This item can be shipped to United States.