Gas frame Petcock hole doesn't fit stock petcock or a high quality one. What should i do?

I heard taping ducks can fix any problem. How many ducks have you taped to solve this issue? Any yet?



There are four petcocks I am aware of, inner fine, inner coarse, outer fine, outer coarse. All Are NPT threads that I have seen an measured, your vendor may vary. I don't know on my new tank, haven't tried it yet.
 
You can use off-the-shelf brass fittings from the hardware store to connect the fuel line to the tank. Then you can add an in-line fuel petcock.
-I think the brass fittings I used were a combination of natural gas and waterline fittings.
-The brass fittings were reducers, threading one inside the other, until fuel line diameter was reached. It was totally trial and error.
How did you get a brass fitting for the hole to not leak? Is it an o-ring or gasket? Do you hqve a picture possibly. My gas bike frame petcock snapped off and I want to use an inline petcock with just the fuel line going in the hole.
 
How did you get a brass fitting for the hole to not leak? Is it an o-ring or gasket? Do you hqve a picture possibly. My gas bike frame petcock snapped off and I want to use an inline petcock with just the fuel line going in the hole.
YELLOW TAPE for gas fittings threads

DO NOT USE WHITE TAPE for water plumbing threads
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