I did read recommondation to have a protective plastic cap for cylinder threads. (will see if LDS has any spare can give me)
You cannot have any kind of cap, tape, etc. over the opening per TSA.
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I did read recommondation to have a protective plastic cap for cylinder threads. (will see if LDS has any spare can give me)
There may be a flaw in Ron's reply that TSA may hang their hat on:
49 CFR Ch. I (10-1-02 Edition)
Part 171.8 Definitions
CYLINDER- means a pressure vessel "designed" for pressures higher than 40 PSIA and having a circular cross section (quotation marks are mine).
This definition does not reqire the vessel to contain any pressure as long as it was designed to hold more than 40 PSI. By this definition any scuba or spare tank would qualify per TSAs restriction.