- New
51146 is a brass 90-degree elbow adapter from Elkhart Supply's BestPEX line, designed for RV fresh-water plumbing systems. It connects 1/2" PEX tubing to a 1/2" male pipe-thread connection (MPT). Its angled design helps redirect the water line when connecting PEX tubing to compatible threaded plumbing components. Verify the connection type and dimensions of your existing plumbing before installation.