2Pcs Swimming Pool Winterization Plugs, 38mm/1.5in Rubber Expansion Gel Plug for Swimming Pool Spa Piping Winter Fittings Maintenance，GU.B/good

【Material】The winter plug is made of high-quality rubber, which has the greatest expansion and good sealing performance, and can be used for a long time.【Excellent Performance】After the swimming pool is drained, the rubber plug is used to block the pipe to prevent water from entering the pipe and causing freezing.【Multipurpose】Used as a rubber plug to block oil skimmer, return water and cleaning lines to prevent water ingress in winter. It is also possible to test the pressure of the pool pipe, or to stop water flows into the pool during equipment maintenance.【Product Packaging】You will receive 2 swimming pool antifreeze caps.Size: about 38mm/1.5in. Specification: Item Type: Expansion Plugs Material: Rubber Color: As shown in the picture Weight: about 145g Application: Used as pipe plugs, to plug skimmers, returns and cleaner lines to prevent water from entering pipes during winter. Expansion plugs also have other uses, such as pressure testing pool lines or other leak detection methods, or stopping pool water flow when equipment repairs are made.