Explore the collection of trap primers, seals, and valves at F.W. Webb. Primers allow small amounts of water to leak into the trap to ensure that the seal remains moist for proper functioning; the trap prevents the backflow of hazardous sewage gas. A trap seal opens to allow water to drain out and closes when the flow stops; this prevents bacteria, pests, and gasses from escaping the drain. We offer durable trap primers, seals, and valves from Precision, Watts, Rectorseal, and other manufacturers. Browse trap primers, seals, and valves in assorted sizes and materials and find options that support your plumbing system.