For use with M18™ Cordless Caulk and Adhesive Guns. This kit includes only the 20 oz Aluminum Barrel. The 20 oz Sausage Style Plunger Rod and Piston Assembly are sold with the 48-08-1093 Aluminum Barrel Conversion Kit. This kit includes the necesssary comonent to convert barrel styles from the 2643-21CT 20oz Clear Barrel Sausage Style Caulk and Adhesive Gun Kit to a aluminum barrel.