I went to Airgas today to buy a 5# tank. It cost me $73 filled. They told me it is $24 for me to have the tank refilled. That did not bother me because the welding shop down the street fills c02 for 75 cents a pound. I got home and was bored so I started reading the small print on the back of my receipt. It says that "The cylinders, fittings and caps covered by this document are rented or leased by Airgas to the customer, not sold....ect". I went in there asking to buy a tank and they gave me the price, so do I own this or am I going to have to go there to have it fied everytime.