Boss BA435 Hydraulic Drive Air Compressor At the heart of the system is an aluminum, single stage, V4, pressure lubricated reciprocating air compressor. Fully assembled in the U.S., the aluminum compressor assembly offers lighter weight and higher thermal efficiency than cast iron compressor assemblies. The BA435 includes an internal oil pump for increased lubrication over that of splash lubrication compressors. The compressor is direct coupled to a 10 GPM gear-type hydraulic driven motor, no need to replace and tension belts when time is of the essence! Routine maintenance items are accessible without the removal of the canopy. The 200 lbs dry weight of the BA435 is half that of competitive brands due to the aluminum compressor, enclosure and small footprint. The aluminum enclosure not only reduces weight, but also is rust resistant. Also, included standard with the Boss BA435 are an integrated hydraulic system cooler, integrated solenoid and relief valve, 12 VDC fan assembly, heavy-duty filtration and NEW two-year warranty for the compressor assembly. The BA435 will serve as a direct replacement unit for those already in the field. No need to modify existing equipment or stock additional replacement parts.