I looked everywhere for a venturi valve that could be used to inject chemical in to the solution line to feed a wand, never found one. they always needed either high flow like on a wash-down Lance used for TFR or they had too little flow like the venturi valve used on the hydraforce..... which has the flow need to pre-spray with a single jet lance but these don't have the flow to feed a 4 jet wand
i would double check these will do what you actually want.