I've never used a vacuum pump and am embarrassed to say that I am perplexed at how to plumb this 2-stage Gast pump. I bought it "used" from a guy who claims it has never been used, and it looks brand new. It has 2 inputs and 2 outputs. Anyway, as given to me, it has the 2 outputs are plumbed together with a single open end where air exhausts. The 2 suction ports each have "can" intake filters attached.
I'm unsure how to plumb it for a vacuum chuck. Do I simple parallel the intakes together like the outputs are? Or do I feed one output to the input of the second? I cannot find any information in the pitiful manual that I've found, and I haven't found any images that point to how to plumb it. I'm guessing I'll get more volume in parallel and more suction in series. Any one know and willing to help? The pump is a Gast dual stage diaphragm pump model BFB-DAA-P716A-EB. Photo below shows the outputs plumbed together as described.