I rock a 3000ml buchner and a 5000ml eryml flask. Before was 3x 600ml to 3x 2000ml eryml flasks. All pulling -25hg on my wobble.
Gotta have systems un palce to rock 3 buchner funnels with minimal down time.
Do NOT use a 5000ml to a 10,000 eryml flask under vac. BOOM! Happened to me. It could have been the elcheapo china junk glass. I was only pulling -15hg.