Part number 424253 quick silver

[steplift20]

Spare, it has three hole outlets one small one that I think is hooked to the oil and two larger hole outlets
The larger outlets / hole air flows thru no problem
The smaller outlet/hole that the oil hose goes to has no air flow at all even when I close one larger hole and blow nothing goes thru the smaller one
Is that good?
I don't understand what the oil outlet hole does? If no air flows thru than how does the oil flow thru? I guess that's why you mechanics get the big bucks, I would love to learn how it all works but I'm retired now and just want to fix what I have.