SPD female AN fitting for aluminum pipes. Slip the tube nut over the tubing followed by the cutting ring, then screw the an fitting to to the tube nut so the cutting ring expands into the aluminum tube. When this is done the application can be used with the rest of the AN system without leakage. Tube nut, cutting ring and an fitting is included. No special assembly tools needed. If cutting ring is disassembled from tubing it is consumed. Extra cutting rings are available seperately. AN10 female thread swivel that spins around its own axis for easy installation. AN fittings of the highest quality with good warranties.