Tru-Flate is well known for it's air line fittings. I have use many of them over the years and this one is much the same as the others. Over the past year I have ordered and used many different brass fittings. This is one of them. No Tru-Flate fitting has ever failed me. The threads are well within specification for NPT design. When wrapped with PTFE and tightened properly (not over-tight..) they should not leak. The barbed shank is longer than most others and holds tightly to hose. Once again, when clamped properly there should never be a leak. The hex shape on the exterior is perfect for use with a typical open-end wrench. Nicely machined and finished.