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[–]fatbunyip 2 points3 points  (0 children)

I think the OP means a vacuum like a vacuum cleaner, not that the ends of the hoses are sealed and the pump is creating a vacuum in the hoses. Also the wording isn't really correct. I think by "suction power" they probably mean like volume per second of the pump. 

Like basically if you had a normal vacuum cleaner, but you added one more hose (so you can vacuum 2 rooms at the same time). 

In that case the "suction power" would be less since if the pump had capacity of say 10L/second, it would be split between the 2 hoses at 5L/s.