Imported from UK, quality seems good. Cork-seal plunger function. Not-so-common petcock thread used on vintage British motorcycles, 1/8 British Standard Pipe. If in doubt, the hole in your tank is roughly 3/8" SAE.
Uses smaller ferrule and nut at line end, can be purchased here: https://www.ebay.com/itm/182475906807
Seals at tank with teflon tape or fiber/statoseal washer, not supplied.
I will answer questions promptly, good luck and thanks for looking.