"Never pay lease or rent charges again Brand new industrial-grade welding gas cylinder has never been filled. Refillable and exchangeable. Provides approx 1 hr. burn time when matched with the same size acetylene cylinder, using an oxyacetylene cutting torch. Capacity cu. ft. 40, DOT Approved Yes, Product Type Cylinder, Diameter in. 7, Dimensions L x W x H in. 7 x 7 x 17, Valve Type CGA 540 male, Compatible With Oxygen. #2 size Empty Provides approx. 1 hr. burn time matched with same size acetylene cylinder using a #0 1/2in. cutting tip on oxyacetylene cutting torch"