19252-921-020 Seal Ring - Overview. The 19252-921-020 Seal Ring is a critical component in Honda marine engine systems, specifically designed to support the water pump and vertical shaft systems. This seal ring ensures the creation of a watertight moisture barrier that prevents leaks and maintains optimal engine performance. Crafted to meet factory specifications and tolerances, it guarantees seamless integration with existing parts, maintaining durability and reliability under harsh marine cond