Dripless Inc. ETS3000 Ergo-Tech Industrial Caulk Gun. Ergonomically designed composite construction. Hardened rod and powder metal drive dog. Rugged composite construction weighs up to 40-percent less than other models. Extra long clean-out rod that snaps in place when not in use. 18:1 thrust ratio for medium- to heavy-weight sealants and caulks. Industrial heavy duty ergo composite caulk gun provides superior performance. Engineered ergonomic grip to keep the wrist in a natural and balanced position for comfort.