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Originally Posted by chefwong
It is because the container only holds 7 on the GG version. There is a version that holds 9.5 Q if memory recalls.
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ah thats it! good point! as the canister fills, you lose vacuum power... my mityvac is 9.5 quarts so it may have a little more power at the end to suck up the extra...
fwiw, it takes the same amount of time to do either... one, you unbolt and let it drain itself, the other you pump the handle until you don't have any left...