Yamaha Back Up Ring Trim Piston 6H1-43872-10

The part number 6H1-43872-10 refers to a Yamaha back-up ring, specifically for the power trim and tilt system of certain Yamaha outboard motors. Its primary function is to provide support to the main seals in the hydraulic system, preventing leaks and maintaining proper pressure. This is crucial for the smooth and reliable operation of the trim and tilt mechanism.