You could consider the AL2712-SM for the aluminum unit as seen here:
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Or you could consider the SS2712-SM for the stainless steel unit which is not listed in our site but mentioned in the manufacturers catalog as seen on page 6 here:
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and finally you could consider plastic units from Cato such as the Cato 10520RRC Chief Fire Extinguisher Cabinet for 20 lb. Extinguisher, 9" Depth - Red as seen here: