I’ve run a 250ml flask with one of these Robinair 15500 Vacuum Pump, 5.0 CFM | ToolDiscounter
Did the job.
Documented here: 500ml or 2L - #4 by cyclopath sort of…
Also pictures of the 50ml flask setup (for ants) that went to @Roguelab
Edit: not certain that’s the SAME hvac pump. You want the dual stage version…and @beaker threw a E2M30 at the problem.