. Also, a lot of people will needlessly waste oxygen by cranking the regulators up. Rule of thumb is 1 part acet to 5 parts oxy, never exceed a 1 to 7 ratio (backfires/burnback). If you set your acet to 5#, then you shouldn't have the oxygen set any higher than 25 or 30. Anything more is $$ out the window. Regulators/gauges are notoriously inaccurate so a person should really learn how to set your regulators/flame by 'balancing the torch". .