1/4" NPT is a standardized thread no matter what kind of fitting is used. The petcock has an extended outlet that a piece of 3/8" rubber fuel line fits perfectly if you want to direct the stream into a catch container, etc.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!