Venturi Pump legality

[Mark McLeod]

The only inspection issue that I think you would have to address with that Venturi device (not the suction cups which are down stream, but just the first photo device) is that as a connected pneumatics part it must be officially certified to pass the required FRC pressure rating rules.
For instance, you would need a spec sheet for the device that it is rated for 120psi or greater (or whatever the season rules might specify).

[GeeTwo]

I strongly suspect that you could get far more vacuum with a vacuum pump (fitted with an FRC-compliant motor) than Venturi behind a 1 cfm compressor. Another alternative would be a vacuum cleaner or a squirrel-cage fan with a duct sealed over the intake, either powered by an FRC motor; this would be less expensive, and the modification would probably be easier.