Chemical Dispenser Rebaring Caulking Gun DM585.CM385 & CM585 Variant 385 / 585ml side by side 3:1 ratio cartridge, Material Steel body and mechanism. The smooth pressure rod requires less force and is quieter than a ratchet-style pressure rod. The rod retracts after each pull of the trigger, removing pressure from the tube to help prevent dripping. The handle and trigger are padded for comfort. There is a welded plate in the back for securing the cartridge in place. A seal puncture tool and a spout cutter are built into the side of gun for opening cartridges without a knife, and the hook on the back allows it to hang on a ladder. Caulking guns, also called caulk or cartridge guns, dispense a controlled flow of products such as caulk, sealants, and adhesives from a tube or cartridge.