Mercury - Quicksilver 823894 J-Joint Seal MerCruiser Sterndrives 823894. Overview. Keeping water out and performance up starts with the right seal. The Quicksilver 823894 J-Joint Seal is a genuine OEM part designed for a wide range of MerCruiser sterndrives, both vintage and modern - including IA, IB, IC, EZ Shift, 120/140, 470/485, 160/165, 888, 898/228/250/260, R, MR, Alpha One, Alpha One SS, and Alpha One Gen II.. This durable seal prevents water intrusion between critical housing components,