hi , due to having a few probs locating a bigger bottle and having it filled , no buggar will do it without either paying rental on a bottle or having it filled which isnt also cheep , so as these small thow awaybottles are a waste of time , ive change of a 7lb bottle of argon full for 60?is this dear of cheep etc , any approx idea on the gas flow setting and approx time this will last ,