This 1-1/2" winterizing plug is the perfect solution for protecting your pool during the off-season. Designed for use in both above-ground and in-ground pools, it fits most standard return jets and is compatible with leading pool equipment brands, including Hayward, Pentair, Jandy, and Waterway. Featuring durable, high-quality material, these plugs can withstand extreme cold temperatures without slipping or shrinking. The 1-1/2" NTP male threaded design also replaces the Hayward filter drain plug (SP1022C).