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LOL, yes to both, sorry for being a smartass. If you can buy the little caps somewhere in bulk I would absolutely put them on, but carry a pill bottle full of spares for the ones that do go missing.
If you think you can keep them in place on all the zerks on the machine then knock yourself out.
However you might think on what exactly is the reason for using the caps.? If it is to keep the "business end" of the zerk clean then you could achieve exactly the same result by not using the caps and carrying a clean rag round the machine with you when greasing. Wipe each zerk before applying grease and wipe the excess grease off it afterwards. Same result as far as I can see - unless your intention for using the caps is something different that is.
They are useless. New machines come with them I pop them all off. Leave the caps on and it’s a guarantee that fitting won’t get greased or the idiot doing the greasing will try to grease the cap.
My thoughts are that if you are greasing the machine as often as it should be then they would not be needed. There is a little check ball in there to keep the grease in and dirt out. So if you make sure you replace any bad Zerks and take a second to wipe them off before sticking the coupler on then they are not of any real use 99% of the time.
About the best thing about them on a new machine is it keeps the painter from sealing them up so they won't take grease or end up wrecking your coupler with dried up paint.
They're like a lot of stuff, great ideal on paper, not so great in the real world. I've got a **** ton in a bin somewhere tho in assorted colors, we have one or two places that try and use them so I end up replacing them.