This aluminum expander fitting will step up your male AN fitting for use with larger hose. Each adapter has a small female nut (to fit your male AN fitting) and a larger male AN fitting (to accept your hose end).
The two-piece design allows the female nut to swivel independently of the male fitting to avoid flare damage. No sealing washer or O-ring is required. AN-type fittings have 37° sealing flares and conform to SAE / JIC standards. Sold individually.