Stainless Steel Adapter, Female JIC 37 deg Flare To 9/16-18 Male JIC 37 deg Flare, Straight Reducer

For a fit check, the key identifiers are a female JIC 37° flare on one end and a 9/16-18 male JIC 37° flare on the other, in a straight inline reducer body. It is also called out with a 0.38 inch tube OD, which helps when you are matching it up to an existing line size.

For a 3/8 inch OD tube on the female side connecting to a 9/16-18 male JIC thread, yes, that's exactly what this reducer is built for. Both ends use the 37 degree flare seat, so as long as your existing lines are JIC flare fittings, it'll mate up inline without any adapters in between. The part number is J8-6TER if you need to cross-reference it against your current parts list.