Forgot to provide a link for you to look at the pump I am talking about.

http://www.gastmfg.com/pdf/rotvane/23_series.pdf

(Errol) wrote in message om...
Hi from Vac-Clamp
We manufacture vacuum clamps specifically for the job that you
mention. They are powered by compressed air, venturi creates the
vacuum, replaceable rubber seal is the only item to wear out.
Two different types available, single sided (bench mounted)and double
sided

Website http://www.vac-clamp.com