I gave 5 stars for accuracy but I can't verify for sure. But what I need most is to evaluate and compare relative pump pressure and breath pressure. Perfect. I also bought the necessary tap and drill bit to adjust the thread. Between Revain, Lowe's, and H. Depot, you can build an emergency fan in your garage for about $100! Yes, hospitals have ventilators, but if you can't get in, you can't get hooked up to them! We both had Covid and we're scared of the second round and at 80 we can't survive even a second. Also note that there are many designs on the internet, all of which look feasible. Much luck. mike
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