I have inherited a Generac model 09617-0 type 6600 PSI 2200 - GPM 3.0. I don�t know anything about pressure washers. The engine does run (Briggs I think) and the pump does put out water. I need to put sprayer tips on the wand. Enclosed is a picture of what I have on the end of the wand. Do I need a quick control spray nozzle and then attach the spray tip to the nozzle - or can I attach the spray tip to the end of the wand with the extension in the pic. Does the GPM 3.0 refer to the quick control spray nozzle size? I noticed that the spray nozzle comes in a 3.0 size. Does the threaded part of the wand extension measure 1/4"? I only want one tip - not an assortment of several. I assume that the different size tips (3.0,3.5 etc) refers to the tip point. Appreciate suggestions.