Materials: 18, 22, 30 oz. PVC, 40 oz. urethaneFills with waterEasy to use fillclosure valveSizes: 2'x2', 3'x3', 4'x4', 5'x5', 6'x6'Custom sizes availableHusky drain covers are designed as a bladder to be filled with water and placed over a sewer or storm drain in order to eliminate any toxic waste or hazardous materials from entering the sewer or storm drain systems. They come in several sizes and can be custom built to your size requirements.