B&K 3/8-in Threaded Male Adapter Union Fitting

For use on fuel, oil, LP and natural gas lines and systems. Connects with aluminum, copper, brass and welded steel tubing that can be flared. Machined, 1-piece brass body. Recommended for higher pressures than those covered by compression fittings. Pressure rating: 1650 psi maximum. 5/8-18 threads. No-lead product CSA certified to NSF 372, low lead content certification program – plumbing products class 6853-01.