I'm on my third NOMAD II. The first one dead on arrival. PA sends me a new one. Second unit last three weeks... won't build pressure... PA sends me a new one. Third one lasted 10 months and won't build pressure. I have called air venturi every day for a week and been on hold until I get their canned " no one is available message leave your name and email and phone number". A week later NOTHING from them... I've called daily. At this point this is beyond a joke.... they sold a pile of garbage and now I can't get a hold of them to figure out what I'm supposed to do with this third NOMAD....