A same-size straight adapter with an AN12 male 37-degree flare on the hose side and an AN12 male O-ring port thread on the component side. AN12 belongs to the high-volume end of the range, typically used for dry sump scavenge and pressure lines, large oil cooler circuits, turbo drains and fuel returns on serious builds, where minimising restriction matters. The straight port thread seals by compressing its O-ring against the machined face of the boss, so nothing goes on the threads and the joint stays serviceable. Confirm the component is machined for a straight-thread O-ring boss and not for tapered pipe thread before fitting.