terrible service! the regulator that we were given leaks. the dr. could not get it to work. the dr called lynn care. some one came. I was on the toilet. my wife, in a wheel chair, could not get to the door fast enough. he was gone. we received no phone call. either before or after. my wife had a appointment. she was out of oxygen. I called, I was told to come into the office. I was given a ful ltank and they put a washer on the regulator. it seemed to work. when we got home the regulator was leaking was leaking. the next morning I called. I was told, it was working when you left, bring it in we will check it out. gee wiz holy cow,etc. .