Premium Quality The swimming pool winterization plug is made of sturdy rubber and stainless steel wing nuts. The material has no pungent odor. The conical shape has a good seal. Effective protectionWinter plugs for rubber swimming pools are easy. It prevents water from flowing into the pipe in winter and thus reliably protects nozzles and drainage openings from frost damage. Stainless steel wing nut Compared with plastic nuts, stainless steel wing nut can bear better load when tightened and is not easy to break. This can also be used to screw the plug tightly into the end of the hose to make it leak-proof. Wide Applications The swimming pool plug has a diameter of 51mm. It fits all common swimming pool inlet nozzles and is also suitable for pressure testing or maintenance of swimming pool pipes. The swimming pool inlet nozzle can be used as a plug pipe, oil skimmer, return pipe and detergent pipe to prevent water from entering the pipe in winter. It is also ideal for other purposes, such as testing pool hose pressure or other leak detection methods, or stopping the flow of water into the pool during equipment maintenance. Specifications: Material: rubber + metal Diameter: 51 mm / 2 inches Box contents: 2 x winter caps, intake nozzle