Eaton Weatherhead C5315X6 Carbon Steel SAE 37 Degree (JIC) Flare-Twin Fitting, Adapter, 3/8" Straight Thread O-Ring Boss x 3/8" JIC Male (Pack of 10) Adapts 3/8" O-ring boss male end to 3/8" JIC 37-degree flare male end Carbon steel for durability and resistance to rupture under high pressure For use with LP and natural gas, refrigeration, and hydraulic applications