TheLincoln Dual-piston Grease Gun, No. 1154, can switch between high-pressure and high-volume delivery for higher efficiency in many jobs, including those with large lubrication requirements, high tolerance lube points or clogged fittings. The thumb-operated switch allows users to adjust the tool to match the equipment’s lube requirements, such a the large surface area of a fifth wheel. The pressure position has a standard grease gun output of 38 strokes/oz. The quick-prime design allows for immediate operation.