Visuals for me are $18 and that includes the air fill and new neck O-ring. That’s only $216 for three years on my 4 tanks. Not really worth it since if I was inspecting my own I would have to pay for the air fill at $6 each and an O-ring for $.50 each. Besides I’m not going to step on my local shops toes. It would be Ok if there wasn’t a local shop and I had the air station.