Hello everyone, I hope I've posted this in the correct section. I recently acquired a homemade splitter, I haven't used it yet because it needs some modifying to suit my needs. I'm thinking about replacing the pump with a 2 stage unit from northern tool but before I do I would like to see if this one may be a keeper. And I cant find any specs on the pump. I found Rexroth and s20s20dh81r on the pump, If anyone knows anything about these pumps I would greatly appreciate any help.