Anyone ever consider doing a closed vessel with one of these pulling a vacuum on it for a sparge?
https://www.ebay.com/itm/393376437334?hash=item5b97101456:g:o~QAAOSwsdNguEvX
https://www.ebay.com/itm/393376437334?hash=item5b97101456:g:o~QAAOSwsdNguEvX