Features1This winterizing plug is made of rubber and has maximum expandability to ensure a tight seal. 2Used as a plug to plug the oil skimmer, return pipe and detergent pipe to prevent water from entering in winter. 3Expansion plugs are also used for other purposes, such as pressure testing pool pipelines or other leak detection methods, or preventing water from flowing out of the pool during equipment maintenance. 4Use this rubber expansion plug to protect your swimming pool from the harsh winter. 5This pool winter plug strictly follows factory quality control, compact size and easy to carry.SpecificationItem Type: Winterizing PlugSpecification: Approx. 63mm / 2.5inPurpose: Used as a pipe plug, plugging oil skimmer, return pipe and detergent pipeline-to prevent water from entering the pipeline in winter. Expansion plugs are also used for other purposes, such as pressure testing pool pipelines or other leak detection methods, or preventing water from flowing out of the pool during equipment maintenance.Weight: Approx. 145 g / 5.1 ozPackage List1 x Winterizing Plug