i never belived it till i tried it this year, but all them days ya will get sap with vac! last couple days my lines with vac ran about 3/4 gal per tap, and by comparison the best day my two other gravity lines ran less than 1/4 gal per tap on the best day, infact 2 of the days they didnt run any noticable amount at all, like maybe 2 gal off 75 taps, compared to 250 off my 300 on vac!














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