Ralph, The venturi effect in the second stage is directed at the back of the hp diaphragm, and does boost the intermediate pressure. Thus, there are 2 first stages that appear identical to the naked eye, one for the Odin (part #162962) and a different one for the Cyklon 5000 part #163257). Amazingly, there is a significant price difference between the two first stages, with the Cyklon first stage going for about $60 more wholesale than the Odin first stage. John
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