A straight adapter with an AN10 37-degree male flare on one end and an M14*1.5 male metric thread on the other. M14*1.5 appears on a great many oil feed and return bosses, cooler adapter plates and pump housings on metric-engineered engines, and this fitting is the clean way to plumb them with -10 AN braided hose rather than improvising with reducers. The -10 size is chosen for oil cooler circuits, scavenge lines and high-volume fuel work where restriction matters. Seal the metric end using the washer or O-ring the port calls for, and simply torque the AN flare against its mating fitting without any sealant or tape.