RC asm club link http://reefcentral.com/forums/showth...5&pagenumber=1 (seems couple of hundred pages)

this link shows the part the rear part not the venturi

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Shortcut to: http://reefcentral.com/forums/showth...&pagenumber=50

The picture shows two parts, the venturi and pump impeller cover (which you rotate to remove).

thanks
I thought it did something else other than getteing access to the impeller/