Made from UV-resistant ABS material, this winterizing cap is built to withstand harsh weather conditions. The silicone O-ring provides an extra tight seal to prevent any leaks. The cap comes in four sizes (1½", 2", 2½", 3") and is made in the USA, making it a reliable and durable choice for pool maintenance. It is also perfect for remodels, quickly changes color of existing fittings, eliminates the need for costly removal of old fittings (just screw in). It is also easy to install, just screw it in.