5/16?Quick Connect with AN-06 Fuel Access Port and 1/8? NPT Gauge Port More area and smoother transitions from the inlet to the outlet, resulting in less restriction than any other fitting line. The Aeromotive line of custom fittings, adapters and hose-ends are a step above the norm, offering uncompromised fuel flow and positive sealing. Constructed of 6061 T6 aircraft grade aluminum or stainless steel, each component is CNC-machined for precision fit and unmatched flow. All billet aluminum fittings are anodized Type II bright dip black for corrosion protection and unrivaled aesthetics. We offer a complete line of hard to find fittings from OEM specific connections to AN adapters.?All Aeromotive fittings and adapters are fully compatible with gasoline and alcohol based fuels.