For under $250 I built a nitrox stick. What do you charge for one? I'm not going to put out $2700 and have to charge $15 per nitrox fill to make that cost up as a new shop. No one is trying to rip off your design. You aren't the only game in town. $2700 is the rip off. I'd rather spend the time partial pressure blending then over charge my customers for your over priced controller. That's all I'm asking on here. So if you are not going to help then stay off my thread.