Myers Patent Mason Jar Lid? Need Some Help on This One!

[FreeBirdTim]

Digging at my 1920's dump site and found an interesting mason jar lid. At least I think it's a mason jar lid. It has "Myers Patent" on it, as well as the number "3". It's very thick and has a hole in the middle. Unfortunately, it has multiple chips, but still a cool find for me. Never seen one before and I couldn't find one on eBay.

Any guesses as to how old this lid may be and why it has a hole in the middle? Any help would be appreciated.

 

Amazon Forum Fav 👍

Upgraded Night Vision Monocular Digital Infrared Monocular Telescope for 100% Darkness with 8X Zoom - Grab it through Amazon!

[2screwed]

That is a hand pump valve seat.

Glass Pump Valve Seat

 

[FreeBirdTim]

Thank you! I never would have guessed that one! It was driving me crazy. Couldn't find one anywhere online.