Pool Winterizing and Drain Plug for Pools and Plumbing A durable expansion plug designed to seal pool skimmers, drains, and plumbing lines for winterizing and maintenance. The plug combines a rubber expansion body with stainless steel and PVC components for a secure, longlasting seal that resists cold and prevents slipping or shrinkage. Key benefits Prevents water entry and backflow during winter to protect pool plumbing from freeze damage. Provides a secure seal for draining or isolating lines during equipment maintenance and repairs. Simple installation and reliable hold thanks to the expanding rubber design and stainless steel fastening. Features Material: stainless steel and PVC with an expanded rubber sealing section. Sizes available: 25 mm, 32 mm, 38 mm, 45 mm, 51 mm, 63 mm. Choose the size that matches the pipe or skimmer opening. Color: black, as shown in product images. Single unit per package. How it works Insert the plug into the pipe or skimmer opening and tighten the stainless steel screw to expand the rubber body. Expansion creates a firm, leakresistant seal to block flow, prevent debris entry, and stop backflow during offseason storage. Practical uses and scenarios Winterizing an outdoor pool: plug skimmer or lines to stop water from entering lines and reduce freezing risk. Equipment maintenance: isolate sections of plumbing while servicing pumps, filters, or heaters to allow controlled drainage. Home and commercial plumbing: temporarily seal sinks, small indoor pools, or storage lines during repairs or renovations. Installation tips Select the plug size closest to the internal diameter of the pipe or opening. Handtighten the stainless screw until the rubber expands and grips firmly. Do not overtighten. Check the seal after installation and periodically during prolonged use. Package contents 1 piece pool plug Notes Allow 1 to 3 mm tolerance for manual measurement. Actual item color may vary slightly from images due to monitor differences.