Quick view Colman Flow Control 12x12x21 Dispenser with Locking Top and Side (No Drawer) Log in for pricing Flow Control Dispenser is made of high- quality clear acrylic. This 12x12x21 inch dispenser with drawers and locks can hold approximately 4,500 5 window tabs and 5,000 3 window tabs. DISFLOW12X12X21 Log in for pricing Quick view