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40 cu. ft capacity B acetylene cylinder, High-quality steel construction with rust-resistant black paint. Fusible metal safety relief alloy built into body of valve. Calcium silicate filler reinforced with alky-resistant glass fiber, asbestos-free. Please note: Acetylene cylinders require a shell inspection every 10 years. They also require an initial porous filler inspection at 5-20 years from the date of the manufacturer. This test is to be done no sooner than 5 years and no later than 20 years from the date of manufacturer. The Shell inspection is marked with an 'S' and the Porous Fill inspection is marked with an 'F'.