10AN 外螺紋喇叭型直通穿牆接頭（附螺帽）

Installed this in my fuel cell return line and the flare seated perfectly with no leaks on the first try. The included nut saved me a trip to the hardware store.

The nut fit snug and the flare sealed perfectly on my first try, no leaks at all. Solid build quality for a bulkhead fitting that you don't have to fight with during install.

Threading was clean and the supplied nut made mounting through the firewall a one-wrench job. No burrs or wobble when I torqued it down, which is exactly what you want from a bulkhead fitting.