This flush kit is designed specifically for the unit I have, and should have the same flow restrictor just incorporated into the flush kit. I was generally aware that the flow restrictor should be located where the waste line connects, but I just don't see it unless it is inside the membrane housing. I don't see a knob anywhere and do not believe it to be an adjustable restrictor, just a basic 100 gpd. I didn't want to take the membrane housing apart right now if I didn't have to. The Purely H2O website in giving the instructions refers to a FAQ for "Where is my Flow Restrictor", but I can't find that FAQ anywhere on their site. Thanks for your advice.