This CRL Grease Gun is a precision-made, heavy-duty constructed gun built to give years of reliable use under rugged conditions. It is designed for multiple reloading, using cartridges of WL14 or bulk material. You can develop pressures of up to 10,000 psi. It is well balanced for easy handling, with a natural-shaped handle. It loads three ways, and a positive action plunger sizes automatically for cartridge or bulk. E-Z Air Vent cap. Safety lock cap prevents accidental plunger release while loading.