Oil priming after internal engine work

[Lonestar10]

I would use something like this and air regulate it to pump slowly they come in so many sizes and can be used for many different products while being completely easily user serviceable and rebuildable. used larger 2"-4" ones to pump everything from water to water agitated sand to basically sludge. most of the time if theres an issue take it apart clean the check balls put it back together and off to the races again.

so i would say in a shop these could be used for oil priming / crank case filling / diesel transfer out of a trucks tanks for tank removal and all sorts of other things then just run a bit of cleaner through it and onto its next product.

https://amzn.to/3983CaF