Gaskets

Prevent leaks and protect performance with precision-fit boat gaskets, O-rings, and seals from WaterSkis.com. Whether you're replacing a worn fuel pump gasket, installing a new fuel sender gasket, or rebuilding key engine gaskets, this category includes the essential sealing components to keep your boat’s systems running clean and efficient.

Our curated selection includes OEM and high-quality aftermarket gaskets for Mastercraft, Supra, and Moomba boats. Each gasket and seal is designed for exact fitment, so you can repair with confidence and get back on the water faster. Use our Boat Part Lookup Tool to quickly find compatible parts for your specific model—no guesswork required.

When performance matters, don’t cut corners. Trust WaterSkis.com to deliver the right gaskets and seals for long-lasting reliability, whether you're cruising, skiing, or wakeboarding all weekend long.


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  • Indmar Thermostat Gasket Indmar Thermostat Gasket 3 Bolt For 350

    Indmar Thermostat Gasket 3 Bolt For 350

    Indmar
    $4.50
    Indmar Thermostat Gasket This thermostat gasket is commonly used on Indmar 350 block engines including the RTP-1, MCX, Assault and many others. This is a 3 bolt gasket used on the bottom half of the thermostat housing where it meets the intake manifold...
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    $4.50
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  • Indmar Thermostat Gasket Indmar Thermostat Gasket 2 Bolt For 350

    Indmar Thermostat Gasket 2 Bolt For 350

    Indmar
    $5.00
    Indmar Thermostat Gasket This is commonly used on Indmar 350 Thermostat Gasket for GM 5.0 and 5.7 small block engines including the RTP-1, MCX, Assault, Monsoon, and many others. This is a 2 bolt gasket used on the top half of the thermostat housing,...
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    $5.00
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  • Indmar Thermostat Gasket

    Indmar Thermostat Gasket 3 Bolt Older Style

    Indmar
    $5.00
    Indmar Thermostat Gasket This thermostat gasket is commonly used on many late 80's to early 90's Indmar engines. This gasket measures 3 3/8" across (at the widest point) and 4 1/4" long. This part is commonly found in MasterCraft, Supra, Moomba and Malbu...
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    $5.00
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  • Johnson Raw Water Impeller Gasket

    Johnson Raw Water Pump Impeller Gasket

    Indmar
    $4.99
    Johnson Raw Water Pump Impeller Gasket This Johnson Raw Water Pump Impeller Gasket fits almost all Indmar marine engines (Malibu, Supra, Moomba, etc.) and almost every MasterCraft produced from 1987 until the change to Ilmor engines in 2011. This foam...
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    $4.99
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  • Indmar Exhaust Riser Gasket

    Indmar Exhaust Riser Gasket

    Indmar
    $6.99
    Indmar Exhaust Riser Gasket Indmar exhaust to manifold riser gasket. Used on GM 5.7L small block engines. This part is commonly found in MasterCraft, Supra, Moomba and Malibu boats. Use the boat part look up below to ensure you are purchasing the correct...
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    $6.99
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  • Indmar LT1 Thermostat Gasket

    Indmar Thermostat Gasket LT1 160 Deg

    Indmar
    $17.99
    Indmar LT1 Thermostat Gasket This MasterCraft Indmar LT-1 Corvette thermostat gasket was an engine option in MasterCraft boats from 1993 to 1999. It is used to seal the 160 degree drilled thermostat. Use the boat part look up below to ensure you are...
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    $17.99
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  • Indmar Complete Gasket Kit - 5.7L Vortec MPI

    Indmar Complete Gasket Kit - 5.7L Vortec MPI

    Indmar
    $499.99
    Indmar Complete Gasket Kit - 5.7L Vortec MPI INDMAR 5.7 GASKET SET INCLUDES GASKETS AND SEALS:INTAKE, RISERS, WATER PUMP, VALVE COVERS, HEAD, OIL DRAIN, THERMOSTAT UPPER AND LOWER, REAR SEAL AND RETAINER, OIL PAN, THROTTLE BODY, INTAKE TO PLENUM, FRONT...
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    $499.99
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  • Indmar 350 Exhaust Manifold Indmar 350 Exhaust Manifold (No-Name)

    Indmar 350 Exhaust Manifold

    Indmar
    $799.99
    Indmar 350 Exhaust Manifold  CHEVROLET SMALL BLOCK CENTER RISER EXHAUST MANIFOLD Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    $799.99
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  • Ilmor Distributor Mounting Gasket | PV05903

    Ilmor Distributor Mounting Gasket | PV05903

    Ilmor
    $2.99
    Ilmor Distributor Mounting Gasket | PV05903 This Ilmor distributor mounting gasket is manufactured from factory specified materials to provide performance and durability you can rely on.  
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    $2.99
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  • Fusion 300 NRX Remote Radio Fusion 300 NRX Remote Radio

    Fusion 300 NRX Remote Radio

    MasterCraft
    MSRP: $349.99
    $326.99
    Fusion 300 NRX Remote Radio Fusion's NRX-300 Wired Remote Control makes controlling your compatible Fusion Marine Stereo a breeze. Flush Mount or Dash Mount, the NRX300 offers Multi-Zone Technology allowing for full control or the option to mount a...
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    MSRP: $349.99
    $326.99
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  • MasterCraft Ballast Impeller STD - Orange 13.7 GPM Ballast Impeller STD - Orange 13.7 GPM

    Ballast Impeller STD - Orange 13.7 GPM

    MasterCraft
    $69.99
    Ballast Impeller STD - Orange 13.7 GPM Replacement ballast Impeller for use with Ballast Pumps in MasterCraft Boats. Orange Ballast impellers are designed for ballast systems found in XT and XSeries boats without the FastFill option. They feature a...
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    $69.99
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  • PCM Thermostat Gasket PCM Thermostat Gasket

    PCM Thermostat Gasket

    PCM
    $3.99
    PCM Thermostat Gasket This thermostat gasket was commonly found on PCM engines. Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    $3.99
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