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TSI waterless trap seal by Josam
TSI waterless trap seal can be used in outlet connections of floor drain bodies or the inside of floor drain strainers to help seal the drain opening and prevent odors, sewer gases, and insects such as drain and fruit flies from entering up through the floor drain. Available in 2-, 3-, 3.5-, and 4-inch sizes. A one-way valve blocks odors while allowing water to pass through. It features an attached silicone skirt that prevents insects and rodents from entering.