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The MI-GARD Trap Seal is used in the outlet connections of floor drain bodies, or the inside of floor drain strainers to seal the opening to prevent odors, sewer gases, and inserts from entering up through the floor drain grate. Its four flexible silicone sealing ribs ensure easy installation into openings that have variations in size. The trap seal will open to allow drainage and close when there is no water flow. The MI-GARD Trap Seal is available in six sizes, 1-1/2”, 2”, 3”, 3.5”, 4” and 6”.