The Harbor Freight store in town has a red, AC powered vacuum pump by Central Pneumatic on sale for ten bucks, marked down from 15. It's used to pull vacuum on air conditioning lines prior to adding refrigerant, ad copy only sez "it will pull a full vacuum within 2 minutes. at 4.2CFM ..."
If it is the one I think it is is uses compressed air from you shop compressor for drive. It is a simple venturi.
They work fine as long as your compressor is big enough.
They also make a great backup in case your better vacuum pump breaks in the middle of a layup.
michael
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