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					Originally Posted by Mark_T  ...Airlift vacuum evacuator with appropriately sized air compressor... | 
	
 
Just a comment.  I used my older compressor with a 14 gallon tank.  I had to make two passes with the Airlift but was able to successfully get the dial up to 25 where it belongs.  By "passes" I mean run until the tank is empty, close the valve on the Airlift, uncouple the compressor hose and let the tank refill, then repeat.  
The same thing happens when I blow out my garden sprinklers in the late fall.