Sort:  

YAY! You gave the same answer I received on my FB post. So glad to have a consensus on this one--and grateful for your detailed explanation. I appreciate you telling me where I can find them already @scoopslapues.

As for another use not sure its a spring and ball bearing type of valve. presure from behind helps it stay closed.needs preasure from a grease gun to open.

Yup, 98% sure it is a grease fitting..... and other use is most unlikely.

Sweeeeeet...grateful for knowledgeable people with confidence! Thanks @streetstyle.

You are welcome @everlove Glad to help.