Oil can for ball oilers

So, I decided to send Jen Putzier an email and ask about the double pump, here is their response.

"Hi Tim,

the difference is this: The second pump acts as a primer for the main pump so that the main pump delivers oil on the first stroke and also upside down (at least once)."
 
The double-pump is the only one that will work upside down (and this is definitely a feature you want).
 
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