Poly construction. Sunlight, breakage & chemical-resistant. Large diameter. lip for neat installation. Hose fitting on bottom accepts 3/8'' I.D. hose. Any spills, spray or rainwater can be drained to bilge area. Holds insulated or uninsulated cans, 16 oz. bottles & miscellaneous objects. Dimensions.: 3-1/8''D, major body dia. is 3.770'', top lip diameter is 4.2''.