Sullivan-Palatek Boss D185PIZ4 is a portable air compressor designed for construction, utility, and industrial compressed air applications. The unit is part of the D185 series and is commonly configured for mobile jobsite use, providing compressed air for pneumatic tools, sandblasting, drilling, and general service work. As a diesel-powered compressor package, the D185PIZ4 is built for field operation where reliable air delivery and transportability are required. Sullivan-Palatek equipment is known for industrial compressor systems, and the Boss D185PIZ4 fits within the portable air compressor category used across contractor and maintenance fleets.