The CRL Cox Quart Size Strap Frame Caulking Gun incorporates the strap design for quart 29 fl. oz. (858 ml) size cartridges for lightweight handling. It has the smooth operation of a friction rod, plus a large handle and trigger. Perfect for dispensing low to medium viscosity materials. Strap frame rotates to move nozzle tip where needed. The spring release plunger lets you load and dispense quickly and easily, and releases pressure on the plunger to prevent sealant run-on. Same special Wear Compensating Device feature as other Cox model guns.