Thing is i only use pub co2 as i work for a gas supplies company and i get it free
, we do all gases but air products are tight fisited gits and even i dont get a discount, but i have a way as i did with an 47l oxy cylinder, just need to wait for a cougar five to pop up
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The pub co2 is meant to give a hotter weld, not that i have ever could tell the diffference as i once had a cougar five, this is the equilavent of the BOC argoshield.