My grandfather called 'em Alemites, and I call them alemites.
Zerk sold out early, He doesn't deserve the fame.
Alemite:
Lubrication Fittings - Alemite
From:
https://en.wikipedia.org/wiki/Grease_fitting
The patent for the Zerk fitting was granted to Oscar U. Zerk in January 1929, and the assignee was the Alemite Manufacturing Corporation
Bruce