adapter with socket 1/8 "NPT sensor. AN These adapters are used e.g. if you want to measure fuel pressure in the side of a regulator, etc. Can be used to connect pressure measurement, etc. SPD AN fittings have the absolute highest quality available. All AN fittings are hard anodized, making them highly wear resistant. The AN fittings can be used with all fuels avalible like gasoline, methanol, ethanol and diesel. They are also suitable for use in water, air and oil systems. We offer a full 5-year warranty on all SPD AN connections.