This is a steel AN4 -4 flare male to 1/8" (NPT) National pipe thread male. This Can be used with nitrous or fuel. Typically used on solenoids but this fitting has several uses.
4AN 30" NITROUS OXIDE OR FUEL STAINLESS BRAIDED LINE BLUE OR RED ENDS
Nitrous Express 17041 .041 Single Nitrous Oxide or Fuel Jet Flare Brass Each
6AN 36" NITROUS OXIDE OR FUEL LINE PTFE STAINLESS BRAIDED HOSE BLACK ENDS
6AN 5ft NITROUS OXIDE OR FUEL LINE PTFE STAINLESS BRAIDED HOSE BLACK ENDS
6AN 18in NITROUS OXIDE OR FUEL LINE STAINLESS BRAIDED PTFE HOSE BLACK END STR-90
6AN 10ft NITROUS OXIDE OR FUEL LINE STAINLESS BRAIDED HOSE BLUE ENDS