SPECIAL ORDER ITEM. Review Returns Policy before purchase. The ProPEX lead-free brass to polybutylene coupling collection provides a reliable transition solution for plumbing systems. Engineered for versatility, this coupling allows for the seamless connection of polybutylene tubing to piping systems. Designed for use in both hot and cold domestic potable water applications, this component is built to withstand demanding environments and is even safe for direct burial in soil. Its robust construction ensures a secure and leak-resistant connection, maintaining the integrity of your water delivery infrastructure.