- New
51122 is an Elkhart Supply BestPEX straight brass adapter featuring a 1/2" hose barb on one end and a 1/2" male pipe thread (MPT) on the other. It is designed to connect compatible 1/2" flexible tubing or hose to a female pipe-threaded fitting. This fitting is intended for fresh-water plumbing applications commonly found in RV and trailer systems. Verify the tubing and thread specifications before installation.