Multi-Part Compatibility: Replaces Yamaha 90430-08020-00, 90430-08003-00, 90430-08021-00, 90430-08801-00, 604-45342-00-00 & Sierra 18-4698, Mallory 9-6010, Asaki 90430-08020-00. Aftermarket Fiber Seal Washer Gasket, Including 10 Pcs Dimension: OD: 13mm, ID: 8mm, Thickness: 1.8mm Made of hard and waterproof materials, these fiber gaskets are durable, stiff, lightweight, and oil-resistant This is aftermarket fiber seal washer gasket ,pls check your original size before purchase. MarinePro Lower Unit Oil Drain Gasket for Yamaha 90430-08020-00 – Pack of 10 Keep your Yamaha outboard running smoothly with this 10-pack of MarinePro gaskets, designed to replace Yamaha 90430-08020-00. These precision-crafted seals ensure a leak-free lower unit, perfect for regular maintenance or spares on the go. Wide Application: Fits Yamaha 4-stroke outboards (8-225 HP) and select 2-stroke models (6-225 HP), including popular engines like F40, F115, and 150 HP series. Premium Material: Crafted from Japanese hard fiberboard – lightweight, crush-resistant, and built to withstand oil and saltwater exposure. Exact Fit: Inner diameter: 8 mm (0.31 in), Outer diameter: 13 mm (0.51 in), Thickness: 1.5 mm – matches Yamaha OEM specs for a tight seal. 10-Pack Value: Ideal for seasonal oil changes, multi-engine servicing, or keeping extras for your boat repair kit. Perfect for fishing boats, jet skis, and leisure crafts, these gaskets prevent gear oil leaks and water intrusion. Pair with Yamalube oil for optimal performance.