Part Number: 605178
Indmar 605178 Pipe Plug 3/4"
Maintain reliable cooling system sealing and dependable engine performance with the Indmar 605178 Pipe Plug 3/4". Designed as a genuine OEM replacement, this pipe plug is used in engine block, water jacket, and cooling system applications where secure sealing is essential for proper operation.
Marine cooling systems are constantly exposed to heat, pressure, moisture, and corrosion. Over time, pipe plugs can become damaged, corroded, or difficult to seal due to repeated maintenance and exposure to harsh marine environments. Replacing worn plugs helps prevent coolant leaks, maintain proper system pressure, and protect the engine from overheating-related issues.
Manufactured to Indmar factory specifications, the 605178 3/4" pipe plug is built using durable marine-grade materials engineered for long-term reliability in both freshwater and saltwater conditions. Designed as a direct-fit replacement, it provides dependable sealing performance and straightforward installation for compatible Indmar marine engines.
Common Engine Fitments
The Indmar 605178 pipe plug is commonly used on select Indmar marine engines, including:
- Indmar Assault 5.7L
- Indmar Monsoon 325
- Indmar Monsoon 340
- Indmar Assault 325
- Indmar 5.0L MPI
- Indmar 5.7L MPI
- Select Indmar 6.0L engine applications
These engines are frequently found in:
Supra Models
- Supra Launch 20SSV
- Supra Launch 21V
- Supra Sunsport 22V
- Supra 22SSV
- Supra SA and SL models
Moomba Models
- Moomba Mobius LSV
- Moomba Mobius XLV
- Moomba Outback
- Moomba Mojo
- Moomba Kaiyen
Additional applications may include Malibu and MasterCraft boats equipped with compatible Indmar engine packages.
The 605178 plug is commonly used in engine block and cooling system water jacket ports where maintaining a secure seal is essential for reliable engine cooling and winterization service.
Fitment may vary depending on engine serial number and cooling system configuration, so confirming compatibility with part number 605178 before ordering is recommended.
Key Features
- Genuine Indmar OEM 3/4" pipe plug
- Helps seal engine block and cooling system passages
- Designed for Indmar marine engine applications
- Marine-grade construction for durability and corrosion resistance
- Helps prevent coolant leaks and cooling system pressure loss
- Direct-fit replacement for straightforward installation
Why Replace a Cooling System Pipe Plug?
Pipe plugs are regularly removed during maintenance and winterization, which can eventually lead to damaged threads, corrosion, or poor sealing surfaces. Replacing worn plugs helps maintain proper cooling system integrity and dependable engine performance.
If you’re servicing an Indmar-powered Supra, Moomba, Malibu, or MasterCraft, the 605178 pipe plug delivers the OEM-quality fit and reliable sealing performance your cooling system depends on.