#1-5 Universal Rubber Winter Plug for 1/2 inch to 1 inch Holes - Tapered Variety Multipurpose LHTP15 (1)

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I re-ordered smaller one and from same company because the design idea for excellent seal will work without even testing it.

If you're closing down your pool for the season, these Lamprey Hardware expansion plugs are an absolute must-have for winterization. They provide a completely airtight and watertight seal to protect your plumbing from freezing temperatures and costly pipe bursts. • Heavy-Duty Rubber Compound: The rubber is thick, durable, and highly resilient. It compresses evenly without cracking or tearing, maintaining a reliable seal against constant moisture and freezing conditions. • Premium Stainless Steel Hardware: The wing nuts and bolts are made of high-quality stainless steel, meaning they won't rust or corrode after months of being submerged or exposed to pool chemicals. They unscrew smoothly when it's time to open back up in the spring. • Universal #1-5 Sizing: The tapered design gives you great flexibility, fitting securely into standard return lines, cleaner lines, and skimmers. It creates a snug, reliable fit that won't slip out under pressure. • Prevents Freezing Damage: By completely blocking water from entering the pipes after blowing out the lines, it eliminates the risk of water expanding and cracking your underground plumbing. • Effortless Tool-Free Install: The large wing nuts make installation a breeze. You can easily twist and tighten them by hand to get a maximum expansion seal without needing to wrestle with wrenches or specialized tools. This is a simple, affordable, and incredibly effective piece of preventative maintenance gear. If you want peace of mind all winter long, these plugs deliver flawlessly!

Used on the ball washer on my golf cart. Washer came with a leaky plug. This fits any size of hole I think up to about an inch. Works great and much easier to install and remove than my wine bottle cork.

handy to block the pipe!