Pull draw - push pump

[30-9]

Hi Guys

Dumb question, but I'm old and not that strong

I have one of those pumps which is suppose to make it easier to add tranny and rear gear oil. Think its called a suck and push pump. Anyway, I find it extremely hard to suck/pull oil out of container into pump. My question is, can I remove the top of the pump and pour oil into it and then just push it into tranny or rear?