This high-quality flue sump seal gasket is designed to fit the Worcester Greenstar 25, 27, 29, and 30 CDI all range storage tank water heater. Made in the United Kingdom, this product is built to last and is the perfect replacement part for your existing system. Crafted from durable materials, this seal gasket ensures a tight fit and prevents leakage, helping to extend the lifespan of your boiler. With its easy installation process, you can have your new seal gasket installed in no time and enjoy a warm and comfortable home without any hassle.