63mm Pool Winterizing Plug Rubber + Stainless Steel Swimming Pool Winter Expansion Plug with Screw Versatile ApplicationDesigned as a pipe plug for winter pool maintenance,preventing pipe entry and protecting against freezing. Also useful for pressure testing and backflow prevention during equipment maintenance. Durable ConstructionMade from high-quality rubber and stainless steel,ensuring stability and longevity. Cold-resistant design prevents slipping or shrinking,allowing for long-term use. Easy InstallationSimply screw the plug into the return water inlet to effectively protect your pool pipes from damage and potential freezing. Multipurpose UseSuitable 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 BurstsThese 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