The Bobcat should burn about 8-9 cubic feet of oxygen an hour. You will only get about 14-15 hours of torch time with the 125 tank. That is over $5 per hour for oxygen. That will get old very fast.
There are reputable concentrator dealers that hang out here. The part on a concentrator that goes belly up are the sieve beds. You will want to know how many hours since the sieve beds were refurbished. The more humid the atmosphere where the concentrator lived, the shorter the sieve bed life. Bonus: you won't need a regulator with a concentrator. Since your torch is a surface mix, you won't need the flashback arrestors.
Steve
(My refills for a 251 are $12. )
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Steve & Susie Wright
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