"This ready-to-fill #2 Argon welding gas cylinder ensures that you never have to pay lease or rent charges again. This brand new industrial-grade welding gas cylinder has never been filled. Refillable and exchangeable. U.S.A. Capacity cu. ft. 40, Compatible With Argon gas, Diameter in. 7, Dimensions L x W x H in. 7 x 7 x 17, Product Type Cylinders. Ideal when using Argon gas in MIG stainless steel or aluminum or TIG carbon steel welding applications #2 size Approx. burn time of 3-hrs./fill"