The Centroform EZFORM SV 1217-110V Tabletop Vacuum Forming Machine has an opening to attach your vacuum source (shop vac or other common household vacuums) and an additional outlet to add an electric pump if needed (i.e a vacuum is sold separately and required to operate this product). A Shop vac or similar vacuum removes a lot of air quickly but it does not have a lot of torque a pressure sensitive valve closes automatically when the vacuum is no longer able to suction and what is left can be evacuated by an electric pump if needed (A vacuum pump removes less air with more torque). All stainless steel welded construction.
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