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-   -   NPT Fitting connection to Flare Fitting? (https://www.askmehelpdesk.com/showthread.php?t=576855)

  • May 17, 2011, 08:24 AM
    Hey Jim
    NPT Fitting connection to Flare Fitting?
    I am replacing the propane Cook-Top, 4 burner in my boats' galley (location USA) with a new one made in Italy. The new one has a Compression Female fitting on the propane input, and a adapter 90 degree elbow Male Compression/Male NPT fitting that came with the stove. I bought a 20ft. Propane 3/8 hose, female/female at a supply house and the clerk sold me a Adapter female Flare/male Flare to go on the hose to connect to the NPT fitting saying to be sure to use the yellow Teflon tape on the male threads of the NPT fitting. My Question: Is this the safe and acceptable practice (NPT male to Flare female using tape) or should there be a adapter that is NPT female with male flare? Or is there no such thing as a female NPT?
  • May 17, 2011, 12:23 PM
    hvac1000
    (NPT male to Flare female using tape) or should there be a adapter that is NPT female with male flare? Or is there no such thing as a female NPT?)


    Always use the correct fitting. A female flare fitting will not work on standard NPT threads since the female part is designed to seal (not by the threads like a standard female NPT but by the flare of the tubing being crushed by the flare fitting itself.) No matter how much teflon tape you use it will not be safe. The correct fitting you are looking for is available.
  • May 17, 2011, 02:21 PM
    ma0641
    Gas code, at least for a house, does not allow compression fittings, only flare fittings. Normally you would use an NPT/male flare on the stove with a female flare on the hose. They also have NPT/male flare angles. Don't mess with improper fittings and gas.

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