Steel Adapter, 3/4-16 Male SAE O-Ring Boss (Straight Thread O-Ring) To 3/4-16 Female JIC 37 deg Flare Swivel, Straight

For that hookup, it matches a 3/4-16 male SAE O-Ring Boss on one end and a 3/4-16 female JIC 37 degree flare swivel on the other, in a straight steel adapter.

That's exactly the application this fitting covers. The male end threads into the SAE O-ring Boss port using a 3/4-16 straight thread, and the female JIC swivel on the other end accepts a standard 3/4-16 JIC 37-degree flare line. The swivel feature on the JIC side keeps things from binding up when you're torquing down the hose assembly, which saves a lot of grief during installation.