CHAMPION R70AHU 3Z411 20 25 30 HP 2 STAGE SPLASH LUB COMPRESSOR PUMP HEAD UNLDER. CHAMPION R-70AHU 20, 25, 30 HP TWO STAGE SPLASH LUBRICATED COMPRESSOR PUMP WITH HEAD UNLOADERS. Designed for heavy-duty industrial applications. 100% cast iron cylinders for greater efficiency, cooling, and service life. Pumps are splash lubricated….