VIVOHOME 110V 1/4 HP 3.5 CFM Single Stage Rotary Vane Air Vacuum Pump with Oil Bottle

Yes, 4 CFM should be fine if it pulls near 29 inHg. If you still need a pump, VIVOHOME 3.5 CFM is the same small chamber class. Leave plenty of headspace for foam up.

Here. This pump has 5 Pa of vacuum pressure. It'll quickly achieve 99.99% of perfect vacuum. Get the 3.5 CFM if you want a 2 gallon chamber, 5 CFM for a 5 gallon chamber (or just get the 5 CFM anyway for a faster vacuum).

Here. This pump has 5 Pa of vacuum pressure. It'll quickly achieve 99.99% of perfect vacuum. Get the 3.5 CFM if you want a 2 gallon chamber, 5 CFM for a 5 gallon chamber (or just get the 5 CFM anyway for a faster vacuum).