Indmar Marine Exhaust Gasket – Catalyst Special | Part #556202SPEC

Don't overlook this critical sealing component — this genuine Indmar special catalyst exhaust gasket is the correct OEM replacement for Indmar catalyst exhaust systems. Engineered to handle the extreme heat and pressure of the marine exhaust environment, this special specification gasket ensures a perfect seal every time — protecting your engine, your passengers, and your investment.

Compatible with: Indmar marine engines with catalyst exhaust systems fitted to Malibu, Moomba, Supra, and Tige boats. Contact us to verify fitment for your specific model year before ordering.

What makes this a "Special" specification gasket?
The SPEC designation indicates this gasket is built to a special specification beyond the standard exhaust gasket — designed specifically for catalyst exhaust applications where temperatures, pressures, and chemical exposure from the catalytic process are more demanding than a standard exhaust system. Using a standard gasket in a catalyst exhaust application risks premature failure and exhaust leaks. Always use the correct specification gasket for your exhaust system type.

Why is this gasket so important?
The exhaust gasket seals one of the most demanding junctions on your entire engine — where extreme heat, pressure, and exhaust gases meet. A failed exhaust gasket can cause:

• Exhaust gases leaking into the engine bay — a serious carbon monoxide and fire risk
• Water ingestion into the exhaust manifold — leading to catastrophic hydro-lock damage
• Accelerated corrosion at the manifold sealing face
• Loss of engine performance and increased fuel consumption
• Failed emissions compliance due to unfiltered exhaust bypass

When should you replace it?
Replace this gasket every time you:

• Remove the exhaust elbow or manifold for any reason
• Replace the exhaust elbow or catalyst component
• Notice exhaust smell, smoke, or water staining around the manifold area
• Carry out a major engine service or overhaul
• See corrosion or damage at the exhaust manifold face

Pro tip: Always have this gasket on hand before starting any exhaust system work. A gasket is the last thing you want to be waiting on when your engine is already partially disassembled. Order it together with your exhaust elbow — 585018 — and have everything ready before you begin.

Pairs perfectly with:

• 585018 – Exhaust Elbow Catalyst Extended Port
• 585017 – Exhaust Elbow Catalyst Extended Starboard
• 765006 – Exhaust Elbow Catalyst Gasket 5.7L
• 845040 – Hose J-Formed with Spring

Features:

• Genuine Indmar OEM part
• Special specification — designed for catalyst exhaust applications
• High temperature and pressure rated construction
• Precision cut for perfect OEM catalyst exhaust sealing surface fit
• Resists chemical exposure from catalytic exhaust process
• Single use — always replace, never reuse
• Direct replacement — no modifications needed

Part Number: 556202SPEC
In stock and shipped fast from Australia 🇦🇺