Looking for a heavy-duty pump to replace your 5-7.5 HP R-Series compressors or Engine Driven Compressor 13 HP and 14 HP Gas models? The Champion R-15B Bare Pump is here to provide greater efficiency, cooling, and service life for your equipment. Made with die-cast aluminum cylinders with cast-iron sleeves, this pump is splash lubricated and has balanced, fan-type flywheels for optimal airflow and cooling. The rotation is CCW facing flywheel, and intercoolers efficiently dissipate heat. Plus, with an unloader and pilot valve for constant speed operation and a centrifugal unloader for efficient pressure release, you can enjoy loadless starting.