A straight adapter combining an AN6 37-degree male flare with an M16*1.5 male metric thread. M16*1.5 is a mid-size metric port used on oil filter housings, cooler take-off plates, turbo drain bosses and gearbox fittings, and it is comfortably larger than the -6 AN flare, so the AN side governs flow through the joint. That makes this a good pick where the component port is generous but the circuit itself only calls for -6 hose, such as a fuel feed or return, or a small oil supply line. Torque the 37-degree flare clean and dry, and seal the metric end with the washer or O-ring specified for that port.