Pool winterizing and service plugs designed to seal pressure lines, lines, skimmers, sinks, and filter connections to prevent freeze damage and to isolate plumbing during maintenance. Key benefits Prevents freeze damage by sealing water out of pipes and pressure lines during winterization. Creates a secure compression seal that holds under pressure and resists slipping during use. Durable and reusable design for repeated seasonal use or routine maintenance. Corrosion resistant hardware for long service life in pool environments. Features Construction: rubber compression body with stainless steel bolts for strength, corrosion resistance, and reliable clamping. Function: expands to form a tight seal inside a pipe or fitting, suitable for plugging lines, skimmer openings, sink drains, and other pressure lines. Reusability: durable materials allow for repeated installation and removal without degrading performance. Compatibility: available in multiple sizes; confirm the correct size for your pipe or fitting before . Typical applications Winterizing a pool: plug lines and skimmers to keep water out of plumbing and reduce risk of freeze damage. Equipment maintenance: isolate pumps, filters, and heaters when performing repairs or cleaning to prevent backflow and protect internal components. Renovation or testing: temporarily seal pipe ends and sink drains when modifying plumbing or pressure testing lines. Installation and sizing Install by inserting the plug into the pipe or fitting and tightening the stainless steel bolts to compress the rubber body until a snug seal is achieved. Note: accurate sizing is important. Measure the internal diameter of the pipe or fitting and select the matching plug size before . Support and returns If you have any questions or issues with the pool winterizing plug, replacement or options are available.