SPECIAL ORDER ITEM. Review Returns Policy before purchase. The ProPEX brass copper press fitting adapter collection provides a reliable and efficient solution for connecting cross-linked polyethylene piping to copper press systems. Engineered for strength and durability, these adapters ensure a secure and leak-resistant transition between different piping materials in residential and commercial plumbing applications. The design focuses on maximizing flow efficiency and system integrity, making it an ideal choice for professionals seeking high-performance components.