RUBBER RING 25-95602M REC93210-42M70

Function and technical context

The 25-95602M rubber ring is a hydraulic sealing component that serves in the cooling and lubrication systems of Mercury, Mariner and Mercruiser marine engines. Its main function is to guarantee tightness in critical connections where refrigerant and lubricating oil circulate under pressure. A failure in this seal allows salt water to enter the internal circuits of the engine or the loss of cooling fluids, which causes overheating, accelerated corrosion and loss of power when sailing.

When to replace this part?

Rubber rings in cooling systems show progressive degradation due to exposure to fluctuating temperatures, salt water and continuous pressure cycles. Typical symptoms include visible leaks at coolant connections, engine overheating without detected filter blockages, and water ingress into the crankcase detectable by a change in oil color. It is recommended to inspect the condition of these seals during each seasonal inspection and replace them preventively every 5-7 years or when work is carried out on the cooling circuits, thus avoiding costly repairs resulting from internal corrosion or engine seizure at sea.

Engine Compatibility

Mercury/MerCruiser

Equivalent manufacturer part numbers