63mm Pool Winterizing Plug Rubber + Stainless Steel Swimming Pool Winter Expansion Plug with Screw [Versatile Application] Designed as a pipe plug for winter pool maintenance, preventing pipe entry and protecting against freezing. Useful for pressure testing and backflow prevention during equipment maintenance. [Durable Construction] Made from high-quality rubber and stainless steel, ensuring stability and longevity. Cold-resistant design prevents slipping or shrinking, allowing for long-term use. [Easy Installation] Simply screw the plug into the return water inlet to effectively protect your pool pipes from damage and potential freezing. [Multipurpose Use] Suitable for above-ground and in-ground swimming pools, outdoor pools, kitchen and bathroom sinks, and small indoor pools. Can also be used as a pipe plug for connecting storage devices. [Prevent Pipe Bursts] These threaded plugs for pool return pipes help prevent pipe bursts during harsh winter conditions, ensuring your pool system remains intact. Specifications: Material: Rubber + Stainless Steel Size: Large head diameter: 63mm, Small head diameter: 55mm, Applicable diameter: 63mm hole Package included: 1 x Pool Winterizing Plug