There this vacuum pump on amazon for $35 and $20 shipping, which sounds like too good of a deal. It's 1/4hp but it should be enough to purge a small vacuum chamber, right? Amazon.com: Super Deal Single-Stage 3.5CFM Rotary Vane Vacuum Pump 3 CFM 1/4HP HVAC Air tool R410a R134 (VP125+) Blue: Home Improvement Sent from my VS985 4G using Grasscity Forum mobile app