We do not have a recommendation for any specific pump. The pump we use is a dual stage, 5.5 CFM pump with an ultimate vacuum of 2 pascals. The CFM is overkill so we rarely open the vacuum-side valve all the way. In terms of ultimate vacuum, 2 Pa seems good. It doesn’t pull air around the reservoir piston on a WP shock.
On our pump we were able to remove the smaller flare fitting and install the quick-connect fitting included with the Shock Bleeder.
For example: this vacuum pump on Amazon is offered in two versions. Single stage at 5 Pa and dual stage at 0.3 Pa.
(Not a recommendation. Just for reference.)
https://www.amazon.com/VIVOHOME-Single-Rotary-Vacuum-Bottle/dp/B07LBMNV31/ref=sr_1_5?keywords=vacuum%2Bpump&qid=1638581527&sr=8-5&th=1
This vacuum pump on E-bay is a dual stage and cheaper.
(Not a recommendation. Just for reference.)
https://www.ebay.com/itm/363294887223?hash=item5496100d37:g:piwAAOSwvrJhHw9R