The P425/HP375 dual-flow air compressor can deliver air at either 425 cfm at 100 psi or 375 cfm at 150 psi. The air compressor is powered by a Cummins QSB 4.5L diesel engine that meets Tier 4 Final emissions standards. The five-gallon diesel-emission fluid tank needs to be refilled only once every two diesel refills. The compressor’s electronically controlled cooling fan activates only at higher temperatures, saving fuel and lowering overall noise levels.