Technical Neva Lost gas cap info please

I have a Neva-Lost gas cap that I am trying to find the application for....it is a steel version with an aluminum or pot-metal dog-bone handle and is 2" at the base....the threads are 16 tpi with no taper.....any clues?.....Thanks.

 

i have a couple too. they were just another accessory to get your money in the 20's. they come in different threads for all the different brands on the road back then. i'm a T guy, but have not found one with T thread. its for the radiator, not gas i believe

 

Mine is vented, as for a gas tank

 

...O

Or to make an oldie 'steam...'
"Let it out, or bust a seam." Old radiator guy told me that.

 

Radiators weren't pressurized back then. The cap needed to be vented if there wasn't an overflow tube. And since many of the cars in the teens didn't have a separate shell covering the radiator, you would see a tube. So there wasn't one and the cap is vented.

 

good info....Thank You