Steel Reusable 1 Wire Braid Reduced Bore Fitting, 9/16-18 Female JIC 37 deg Flare Swivel, -06 Hose, Short 90 deg Elbow

Your swivel end comes with a 9/16-18 thread and a JIC 37-degree flare. It connects perfectly to the 3/8 inch hose lines you are working with.

The key callouts are a 9/16-18 female JIC 37 degree flare swivel on one end and -06 hose size on the hose end. It’s also a short 90 degree elbow style, so it matches that compact elbow layout.

Reduced bore means the internal flow path through the fitting is narrower than a full-bore equivalent for the same hose size. On this one, the end sizes are 0.5625 in. on the JIC swivel side and 0.375 in. on the hose end, so yes, the bore is stepped down compared to a standard -06 full-bore fitting. For most low-to-medium flow applications that's perfectly fine, but if you're running high flow rates where pressure drop is a concern, it's worth factoring that restriction into your system design.