The Fluidmaster Seal is designed for use with Fluidmaster 100, 200A, and 400A fill valves, ensuring a reliable and leak-free operation. This high-quality seal is made from durable materials that withstand water pressure and temperature variations, making it ideal for residential and commercial applications. With precise dimensions tailored for compatibility with these specific models, it guarantees a perfect fit and optimal performance. The seal is easy to install, providing a quick solution for toilet repairs and maintenance. Upgrade your plumbing system with this essential component to enhance efficiency and longevity.