This 1" x 3mm Black Nitrile Washer is designed for use with Mueller Streamline panels, providing a reliable seal to prevent leaks. Made from durable nitrile rubber, it offers excellent resistance to heat and chemicals, ensuring longevity in various applications. The washer's precise dimensions ensure a snug fit, making it ideal for maintaining the integrity of your heating systems. This component is essential for ensuring optimal performance and efficiency in your installations, compatible with a range of Mueller Streamline products.