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 necessary component to convert barrel styles from the 2643-21CT 20 oz clear barrel sausage style caulk and adhesive gun kit to an aluminum barrel.