A straight adapter combining an AN12 37-degree male flare with an M20*1.5 male metric thread. M20*1.5 is a large metric port found on oil filter mounts, cooler adapter plates, pump take-offs and heavy sender bosses, and with -12 AN hose it gives a genuinely free-flowing path from component to line. Use it for oil cooler circuits, dry sump scavenge, gearbox cooler runs or any high-volume plumbing where restriction is the enemy. Torque the AN flare dry against its mating hose end; no tape or paste belongs on a 37-degree flare. On the metric side, use the sealing washer or O-ring specified for that port rather than thread sealant.