Inline floor drain trap seal with UV resistant ABS plastic frame, silicon rubber sealing flapper and four flexible sealing ribsUsed 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 insects from entering up through the floor drain grateFour flexible silicone sealing ribs ensure easy installation into openings that have variations in sizeCan be used in either new construction or retro-fit applications where trap primers were never installed