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stonylab Rotary Vane Vacuum Pump, 3.5 CFM 5 Pa ¼ HP Single Stage Compact Vacuum Pump with Solenoid Valve for HVAC AC Refrigerant Air Tool: Amazon.com: Industrial & Scientific
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Amazon.com: 12V 0.4-1L/min Miniature Electric DC Motor Diaphragm Vacuum Pump Vacuum Self Priming Water Pump for Air Liquid Equipment : Industrial & Scientific