Vacuum Pump Presses by Bob Brokaw

Bob Brokaw shares his experience of building several vacuum pump systems for vacuum pressing veneer and woodworking projects.
Demonstrated for a live audience March 5, 2016.
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Music licensed to Gwinnett Woodworkers Association by Pond5.com item #26177787 "Holiday Acoustic Guitar".

[@retornaz]

What Model of mac valve is it ? Their have so many models in their catalogue. Thank you in advance.