We used this venturi pump in 2004 to pick up the 2x ball with 6 inch suction cup. It is a very small unit about as big as a lighter. You had to pull hard to get it off. We actually added a blow off because it would take ~5 seconds for the suction to stop on its own. The compressor kept up with it easily, and we never used the extra storage tanks that come in the kit.
http://www.piab.com/Templates/WebBas....aspx?id=10209