This gasket fits 2" or 2½" threaded fittings, making it an ideal solution for a variety of pool installations. It is specifically designed for vinyl, fiberglass and steel installations, providing a secure and tight seal. The product is manufactured from superior engineered UV-resistant engineered polymers, making it durable and long-lasting. It comes in two different sizes, 2" gasket (p/n 20gasket) and 2½" gasket (p/n 25gasket) and 25 per case. This product is the perfect solution for pool builders and remodelers looking to secure fittings in their pool installations. It is an easy to use and cost-effective solution that ensures a secure seal between the fittings and the pipes in pool installations.