✅ SOLVED Plug type thing

[Nathan W]

Found when I got the roller buckle. It says USA but that’s all I can make out. Of course I broke the little handle. Threads are on back. No clue wha tit screwed into

 

[Nathan W]

Found when I got the roller buckle. It says USA but that’s all I can make out. Of course I broke the little handle. Threads are on back. No clue wha tit screwed into

It’s Shrader Regus, hot water bottle canteen plug

 

[Retired Sarge]

It’s Shrader Regus, hot water bottle canteen plug

Though it looked familiar.....But couldn't remember.