Sierra 18-3702 Prop Nut KitSierra 18-3702 Prop Nut Kit is a replacement part for Mercury/Mariner Outboards. Sierra engine parts are manufactured to meet or exceed OEM requirements. For: Mercury/Mariner 30-60 HP outboard engines; Kit Includes: (2) 18-3204 Tab Washer; (1) 18-3704 Prop Nut; Interchangeable with: Chrysler/Force/US Marine; 11-69578A1; GLM; 21260; Mallory; 9-73961; Mercury Marine; 11-69578A1; 11-69578Q1; 11-69578T1;