SPECIAL ORDER ITEM. Review Returns Policy before purchase. The XL Brass Transition Coupling collection provides a reliable solution for connecting different piping materials in residential and commercial plumbing systems. Designed for versatility, this coupling facilitates seamless transitions between PEX and polybutylene piping, ensuring a secure and leak-resistant connection for both hot and cold water applications. Engineered with high-quality materials, this component is built to withstand the rigors of daily use while maintaining structural integrity over time. Its robust construction is specifically formulated to resist dezincification, which helps prevent degradation in challenging water conditions.