Part Number: 551073
Part Number: 551073
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Maintain proper cooling system sealing and dependable engine performance with the Indmar 551073 Water Jacket Plug. Designed as a genuine OEM replacement, this plug seals critical water jacket passages within the engine cooling system to help prevent coolant leaks and maintain proper water circulation.
Water jacket plugs play an important role in marine engine cooling systems by sealing internal coolant passages within the engine block and cylinder heads. Over time, plugs can corrode, weaken, or become damaged from repeated heat cycles, moisture exposure, and cooling system pressure. Replacing worn plugs helps preserve cooling system integrity and reduce the risk of leaks or overheating issues.
Manufactured to Indmar factory specifications, the 551073 water jacket plug is built using durable marine-grade materials engineered for long-term reliability in harsh boating environments. Designed as a direct-fit replacement, it provides dependable fitment and secure sealing performance for compatible Indmar marine engines.
The Indmar 551073 water jacket plug is commonly used on select Indmar marine engines, including:
These engines are frequently found in:
Additional applications may include Malibu and MasterCraft boats equipped with compatible Indmar engine packages.
The 551073 plug is commonly used in engine block cooling jacket systems where maintaining a proper seal is essential for dependable engine cooling and long-term reliability.
Fitment may vary depending on engine serial number and cooling system configuration, so confirming compatibility with part number 551073 before ordering is recommended.
Cooling system plugs can corrode or weaken over time due to constant exposure to coolant, moisture, and engine heat. Replacing worn plugs helps maintain proper cooling system integrity and protects the engine from leaks that could lead to overheating or performance issues.
If you’re servicing an Indmar-powered Supra, Moomba, Malibu, or MasterCraft, the 551073 water jacket plug delivers the OEM-quality fit and dependable sealing performance your engine depends on.