I just got my welding Co2 tank filled back up after I made the mistake of leaving it on. I welded one wk came back a wk later went to turn the tank on and was like why is it so hard to turn on? Then it hit me to try and turn it the other way. I'm not going to make that mistake again. Luckily its not a very expensive one only $35 to fill back up. 

  I just got my welding Co2 tank filled back up after I made the mistake of leaving it on. I welded one wk came back a wk later went to turn the tank on and was like why is it so hard to turn on? Then it hit me to try and turn it the other way. I'm not going to make that mistake again. Luckily its not a very expensive one only $35 to fill back up. 

How big is your tank? Mine is roughly a 6" diameter and 24"" tall (less the valve). Back in 2020 it cost me  $62 for Argon/Co2. Here in California a bit more than half that cost is the gas itself, the rest are "fees." But, yea, I HATE when the tank is left open. Talk about "throwing your money to the wind." Now I close the valve and check it at least three times and then every day for about three days after. The good news is that (assuming I have closed the valve) I get well over 5 years out of a tank, but that is also a testament to what I'm NOT getting done.