Elkhart Supply 51250 1/2 in. PEX x 1/2 in. Polybutylene Brass Coupling with Crimp Ring

The Elkhart Supply 51250 is a 1/2 in. PEX barb x 1/2 in. polybutylene (PolyB) brass insert coupling, packaged with a crimp ring for a complete, ready-to-install connection. Part of Elkhart Supply's BestPEX brass insert fitting line, this adapter is designed to transition between PEX tubing and legacy polybutylene pipe systems — a common need in older home, RV, and mobile home plumbing repairs or upgrades.

The brass barbed insert end accepts standard 1/2 in. SDR-9 PEX tubing secured with a copper or stainless steel crimp ring, while the opposite end features a polybutylene-compatible connection for 1/2 in. PolyB pipe. The all-brass construction ensures long-lasting corrosion resistance and reliable sealing under pressure and heat.

Key Features:

• Connects 1/2 in. PEX tubing to 1/2 in. polybutylene (PolyB) pipe
• Solid brass construction for durability and corrosion resistance
• Includes crimp ring for a complete, ready-to-use installation
• Compatible with copper PEX crimp rings and stainless steel PEX clamps
• Rated for use in hot and cold water supply lines
• Suitable for residential, RV, mobile home, and trailer plumbing applications
• Barcoded contractor packaging (51250 series)

The Elkhart Supply 51250 is an ideal solution for repairing or extending existing polybutylene plumbing systems by transitioning to modern PEX tubing. The included crimp ring eliminates the need for a separate hardware purchase, simplifying the installation process.