Hi , it looks like a clamp of some sort to me? Leon.
"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." Ernest Hemingway
It's a sealing type lid for something!...
It's a wasted trip baby. Nobody said nothing about locking horns with no Tigers.
I'm Spartacus, not really i'm Paul!...
Reminds me of the clamps on high pressure hoses, although I see there is no hole through the cap.