Pricing mentioned is for EA. Requires a minimum buy of 1 piece. Cylinder Cap, High Pressure, 3 1/8 inch, Steel, Yellow; Hazmat=False; Features=Comes in safety yellow for added visibility;Comes with a lock for extra security;Easy access to the valve handle with no need to remove the protective cap and replace regulators each time access to cylinder is needed; CountryOfOrigin=US; Color=Yellow; Diameter=3 1/8 in [Max]; Material=Steel;