40HP 50HP 55HP Water Pump Housing Gasket for Yamaha 2-Stroke Outboards Replaces 663-44316-A0

Quality aftermarket water pump housing gasket suitable for a range of Yamaha 2-stroke outboard engines. This gasket seals the water pump housing and helps maintain proper cooling system operation. Manufactured to OEM specifications for reliable fitment and durability. This gasket corresponds to Item No. 20 on the Yamaha lower unit (drive shaft assembly) diagram. Replaces Part Number 663-44316-A0 Fitment Yamaha Outboards (6E9 / 6H4 / 6H5 Series) 40HP Models with 6E9 and 6H4 serial ranges Approx. 1984-1993 50HP 6H5 Series Models Approx. 1984-1993 55HP Selected Models Approx. 1989-1993 IMPORTANT Please check your engine model, serial number and existing gasket before ordering. If you are unsure of compatibility, send us your engine details and our team will gladly confirm the correct part. Details Water pump housing gasket Premium aftermarket replacement Replaces Yamaha 663-44316-A0 Corresponds to Item No. 20 on Yamaha lower unit diagram Helps maintain proper cooling system sealing Manufactured to OEM specifications Direct-fit replacement Why Buy from SSI Marine Workshop-tested aftermarket & OEM-spec parts Fast UK dispatch (same-day before 1 PM Mon–Fri) Tracked 24-hour UK delivery UK stock – collection available from Leigh (Manchester) Technical support available Buyer Responsibility Please confirm compatibility with your engine model and serial number before purchase. If unsure, contact us — our technical team will be happy to help. Help Page: https://www.ssimarine.co.uk/pages/contact-us