These 3 AN x 1/8 NPT Jet Fittings are mainly used to plumb nitrous and fuel jets into plate systems but their uses are endless. a jet fitting is ideal for replacing damaged fittings, or for plumbing a custom plate system. We also use these fittings in our flow tool. they are machined from aluminum and nicely anodized with red, blue, or black, depending on what works best for your application. 3 AN is the size of a nozzle fitting and 1/8 NPT is a common female size in our solenoids and many manufacturers plate systems.