1” Pool Winterizing Plugs with Stainless Steel Wing Nut (2/Pack)

MEFONKOU 1‑inch pool winterizing expansion plugs come in a set of 2 units for seasonal pool winterization and pipeline maintenance. Each stopper combines cold‑resistant heavy rubber body and stainless steel wing nut for reliable sealing performanceAfter draining your pool for winter shutdown, insert these rubber plugs into return ports, drain ports and skimmer openings. Tighten the wing nut to compress rubber for secure hold, which restricts water entering pipes and lowers potential harm from freezing water expansion.Besides swimming pool winter use, these stoppers support pool line pressure testing, leak inspection and temporary water flow block during repair work. They can also serve as blocking plugs for marine pipelines and household sinks, tubs and drain openingsNo specialized tools are demanded during installation

• Winter Pipe Protection: The 1-inch pool expansion plug seals the return inlet, drain outlet, and skimmer openings after draining the pool. The compressed rubber forms a physical barrier that prevents water from entering the internal piping, reducing the risk of pipe cracks and structural damage caused by water freezing or expanding in cold weather. Suitable for seasonal winter protection of indoor and outdoor residential pools
• High-Quality Materials: Each plug features a cold-resistant, expandable rubber body and comes with a stainless steel wing nut. The rubber maintains its shape in cold outdoor environments and is unlikely to slip out or shrink during long-term winter storage. The stainless steel components resist rust and corrosion caused by pool water, moisture, and outdoor conditions, making them suitable for repeated use. Over-tightening will not cause abnormal expansion of the rubber
• Wide Range of Applications: Designed specifically for winter pool maintenance, these plugs can be used as skimmer plugs, return line plugs, and cleaning line plugs. They are suitable for pressure testing and leak detection in pool systems, as well as for temporarily shutting off water flow during equipment repairs and component replacements. Additionally, they can be used to temporarily seal marine piping, household sinks, bathtubs, and laundry room drains
• Easy Installation: Simply insert the rubber plug fully into the target pipe opening and manually rotate the stainless steel wing nut to apply axial compression, completing the installation. The rubber expands radially to form a tight seal against the inner pipe wall, ensuring a stable, leak-proof seal. Ideal for routine do-it-yourself pool maintenance
• Package Contents: The package contains 2 1-inch rubber expandable pool plugs. Actual fit depends on the inner diameter of your pipe opening. If the pipe diameter does not match, it may result in poor sealing performance or installation failure. Please verify size compatibility to avoid the need for rework later