The Milwaukee 44-94-0675 20OZ Caulking Gun Plunger Rod Assembly restores smooth and consistent material flow for compatible caulking guns. This replacement plunger rod assembly is designed to apply steady pressure to 20-ounce cartridges, pushing sealant or adhesive forward as the trigger is engaged. It works by transferring the mechanical force from the handle to the cartridge base, e... https://www.wholetoolbox.com/milwaukee-44-94-0675-20oz-caulking-gun-plunger-rod-assembly