Brass Reusable 1 Wire Braid Reduced Bore Three-Piece Fitting, 1-1/16-14 Female SAE 45 deg Flare Swivel, -12 Hose, Straight

A mandrel is required during installation to seat the fitting properly against the hose. That applies each time the fitting is assembled, not just the first time around. The reusable designation means the hardware itself can be taken apart and put back on a hose again rather than being crimped and discarded, but the mandrel is part of getting a proper airtight connection every time you reassemble it.

The brass construction offers good corrosion resistance, so it should work well in marine applications.

The key callouts are right in the ends: it’s made for a -12 hose, and the swivel end is a 1-1/16-14 female SAE 45 degree flare. It’s also a straight configuration, with a 1.25 inch hex for wrenching.