Features & Benefits Secondary Used W/ 3121 Primary - 10 Micron - This Is The Shorter Version Of # 3120 Attributes Fuel Filter Gasket O.D. (Inches) : 3.444" Fuel Filter Gasket Thickness (Inches) : .26" Fuel Filter Height (Inches) : 4.354" Fuel Filter Inlet Thread Size (Inches) : 13/16-12 Fuel Filter O.D. (Inches) : 3.663" Fuel Filter Style : Spin-on Fuel Filter Gasket I.D. (Inches) : 3.1" Fuel Filter Gasket O.D. (mm) : 87 mm Fuel Filter Gasket Thickness (mm) : 7 mm Fuel Filter Height (mm) : 111 mm Fuel Filter O.D. (mm) : 93 mm Gasket I.D. (mm) : 79 mm