The Cretelock System is a new and innovative pneumatic tailgate for concrete trucks. It provides positive shut-off to the concrete mixer at the feed hopper, and prevents concrete from spilling into the chute- Shut-off at the point of discharge is achieved through a replaceable wear liner, allowing the drum to turn against the CreteLock. It uses a modular bolt-together construction, which requires no welding and is pneumatically operated with a hand switch inside the cab of the truck and a light to verify if the gate is opened or closed. The product by Mix USA prevents costly spills and allows ready-mix trucks to carry full loads, even in hilly terrain or with high-slump mixes.