Poly-Flo Flareless tube fittings consist of a brass body and nut with brass sleeve. Use with PolyFlo, PVC or Nylaflow pressure tubing. The Poly-Flo fittings have the same configuration as Nylo-Seal fittings of the same basic part number. Note: The fittings are sold individually and not in pair. Brass Poly Flo fittings cannot be used with NSR tubing listed. Use SAE fittings, see Accessories tab.