SharkBite item UCP139Z is a 3/4-in. PEX Press x 1-in. MNPT brass male adapter designed to create secure, permanent transitions between PEX piping and threaded system components. Built with a two-piece, patent-protected design, it incorporates an integrated tool locator and pipe-insertion indicators to ensure accurate, consistent press connections. The fittings lead-free brass construction provides long-lasting durability and corrosion resistance, making it suitable for potable water applications. Compatible with PEX-A, PEX-B, and PEX-C, this adapter supports efficient, code-compliant installations in both residential and commercial plumbing systems.