Blue Anodized Aluminum Adapter, -08 Male JIC 37 deg Flare To 3/8 Inch Male NPT, 45 deg Elbow

It bridges those two thread types in one fitting. One side is a -08 male JIC 37 degree flare, and the other side is a 3/8 inch male NPT, with the body bent at a 45 degree elbow to help you turn the line without stacking extra adapters.

You sure can use this adapter with standard hydraulic fluid. Check out the "Documentlink Fluid Compatibility 1" link in the product details for more specifics on fluid compatibility.

For connecting a -08 JIC 37 degree flare line to a 3/8 inch male NPT port, yes, this adapter handles exactly that transition. The 45 degree elbow angle also gives you some routing flexibility if you're working in a tight spot and need to redirect the line without adding a separate elbow fitting. It's an Eaton Aeroquip piece, catalog number C1CQ31, so it's built for real hydraulic work, not light-duty stuff.