Storage Tank Drain Connection Gender Not Applicable Drain Connection Type Not Applicable Drain Opening Diameter Not Applicable Fill Opening Diameter 6 in Frame Material Not Applicable Graduation Mark Increments 1 gal Liquid Storage Capacity 25 gal Overall Depth 17 1/2 in Overall Diameter 18 in Overall Height 16 in Overall Width 36 in Standards ASTM D1998 FDA Compliant 177.1520 NSF/ANSI 61 Tank Material HDPE Tank Material Thickness 1/4 in Tank Opening Type Closed Top