Sierra 18-7411-9 O-Ring (Pkg Of 5)Sierra replacement O-ring for Mercury, Mercruiser, Johnson, and Evinrude engines. I.D.: 1.250" or 3.2mm; Width: 0.100" or 2.5mm; Package of 5; Interchangeable with: GLM; 81240; Johnson/Evinrude Outboard; 321921; Mercruiser Stern Drive; 25-35480; 25-8M2000816; Mercury Marine; 25-35480; 25-47386;