Underwater Gear

Keep your boat running smooth and tracking true with precision underwater gear from WaterSkis.com. Whether you're replacing a worn Mastercraft drive shaft, upgrading a Moomba rudder, or sourcing an exact-fit Supra strut, we carry genuine OEM and compatible parts built to match factory performance. This category includes critical inboard components like drive shafts, struts, rudders, and other hardware essential to your boat’s handling and power delivery.

Need to find the right part fast? Use our Boat Part Lookup Tool to identify inboard boat underwater gear for your exact year, make, and model—no guesswork required. We stock parts for top ski and wake brands, including Mastercraft, Moomba, and Supra, with quality you can trust in deep water or shallow turns.

For smooth rides and confident control, trust WaterSkis.com for the underwater gear that keeps your boat performing its best.

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  • MasterCraft OEM Rudder MasterCraft OEM Rudder
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    MasterCraft OEM Rudder - 197

    MasterCraft
    $1,190.38
    MasterCraft OEM Rudder- 197 This genuine MasterCraft OEM Rudder is model specific. If you have damaged your rudder, it is typical that your Rudder Port is also damaged along with other under water gear. Use the Parts Finder to select your year make and...
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    $1,190.38
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  • MasterCraft OEM Rudder MasterCraft OEM Rudder
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    MasterCraft OEM Rudder - 196

    MasterCraft
    $1,864.94
    MasterCraft OEM Rudder- 196 This genuine MasterCraft OEM Rudder is model specific. If you have damaged your rudder it is typical that your Rudder Port is also damaged along with other UnderWater Gear. Use the Parts Finder to select your year make and...
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  • MasterCraft OEM Strut MasterCraft OEM Strut
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    MasterCraft OEM Strut - 133

    MasterCraft
    $825.33
    MasterCraft OEM Strut - 133 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat dialed back...
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  • MasterCraft OEM Strut MasterCraft OEM Strut
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    MasterCraft OEM Strut - 131

    MasterCraft
    $753.90
    MasterCraft OEM Strut - 131 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat dialed back...
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    $753.90
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  • MasterCraft OEM Strut MasterCraft OEM Strut - 195
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    MasterCraft OEM Strut - 195

    MasterCraft
    $1,111.02
    MasterCraft OEM Strut - 195 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat dialed back...
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    $1,111.02
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  • MasterCraft OEM Drive Shaft 54.25"- 348 MasterCraft OEM Drive Shaft 54.25"- 348
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    MasterCraft OEM Drive Shaft 54.25"- 348

    MasterCraft
    $2,174.45
    MasterCraft OEM Drive Shaft 54.25"- 348 This genuine MasterCraft drive shaft is 54.25 inches long by 1-1/8 inch diameter with coupler. This drive shaft is specifically designed for the LSA Engine.   **The images are of a MasterCraft Drive Shaft,...
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    $2,174.45
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  • MasterCraft OEM Drive Shaft 52.5" - 345 MasterCraft OEM Drive Shaft 52.5" - 345
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    MasterCraft OEM Drive Shaft 52.5" - 345

    MasterCraft
    $2,142.70
    MasterCraft OEM Drive Shaft 52.5" - 345 This genuine MasterCraft drive shaft is 52.5 inches long by 1-1/8 inch diameter with coupler. This drive shaft is specifically designed for the LSA Engine.   **The images are of a MasterCraft Drive Shaft,...
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    $2,142.70
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  • MasterCraft OEM Strut - 137 MasterCraft OEM Strut - 137
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    MasterCraft OEM Strut - 137

    MasterCraft
    $1,015.79
    MasterCraft OEM Strut - 137 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat dialed back...
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  • MasterCraft OEM Drive Shaft 48.75" - 342 MasterCraft OEM Drive Shaft 48.75" - 342MasterCraft OEM Drive Shaft 48.75" - 342
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    MasterCraft OEM Drive Shaft 48.75" - 342

    MasterCraft
    $1,158.64
    MasterCraft OEM Drive Shaft 48.75" - 342 This drive shaft is measured to be 48.75 inches long by 1-1/8inch in diameter. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific Drive Shaft may...
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  • MasterCraft OEM Drive Shaft 50.5" - 341 MasterCraft OEM Drive Shaft 50.5" - 341
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    MasterCraft OEM Drive Shaft 50.5" - 341

    MasterCraft
    $1,230.06
      MasterCraft OEM Drive Shaft 50.5" - 341 This drive shaft is measured to be 50.5 inches long by 1-1/8inch in diameter. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific Drive Shaft...
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    $1,230.06
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  • MasterCraft OEM Drive Shaft 49" - 337 MasterCraft OEM Drive Shaft 49" - 337
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    MasterCraft OEM Drive Shaft 49" - 337

    MasterCraft
    $1,198.32
    MasterCraft OEM Drive Shaft 49" - 337 This drive shaft is measured to be 49 inches long by 1-1/8inch in diameter. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific Drive Shaft may look...
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    $1,198.32
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  • MasterCraft OEM Nose Cone Strut MasterCraft OEM Nose Cone Strut
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    MasterCraft OEM Strut - 136

    MasterCraft
    $857.07
    MasterCraft OEM Strut - 136 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat dialed back...
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    $857.07
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  • MasterCraft OEM Drive Shaft 57.25" - 334 MasterCraft OEM Drive Shaft 57.25" - 334
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    MasterCraft OEM Drive Shaft 57.25" - 334

    MasterCraft
    $944.37
    MasterCraft OEM Drive Shaft 57.25" - 334 This drive shaft is measured to be 57.25 inches long by 1-1/8inch in diameter. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific Drive Shaft may...
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    $944.37
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  • MasterCraft OEM Drive Shaft 54.25" - 335 MasterCraft OEM Drive Shaft 54.25" - 335
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    MasterCraft OEM Drive Shaft 54.25" - 335

    MasterCraft
    $1,666.54
    MasterCraft OEM Drive Shaft 54.25" - 335 This drive shaft is measured to be 54.25 inches long by 1-1/8inch in diameter. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific Drive Shaft may...
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  • MasterCraft OEM Strut - Port - 145 MasterCraft OEM Strut - Port - 145
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    MasterCraft OEM Strut - Port - 101

    MasterCraft
    $468.21
    MasterCraft OEM Strut - Port - 101 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat...
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    $468.21
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  • MasterCraft OEM Drive Shaft 58" - 329 MasterCraft OEM Drive Shaft 58" - 329
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    MasterCraft OEM Drive Shaft 58" - 329

    MasterCraft
    $1,549.09
    MasterCraft OEM Drive Shaft 58" - 329 This drive shaft is measured to be 58 inches long by 1-1/8inch in diameter and comes with a 5inch coupler. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the...
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  • MasterCraft OEM Drive Shaft 56.25"- 333 MasterCraft OEM Drive Shaft 56.25"- 333
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    MasterCraft OEM Drive Shaft 56.25"- 333

    MasterCraft
    $888.82
    MasterCraft OEM Drive Shaft 56.25"- 333 This drive shaft is measured to be 56 and 1/4 inches long by 1-1/8inch in diameter. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific Drive Shaft...
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    $888.82
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  • MasterCraft OEM Drive Shaft - 58" - 330 MasterCraft OEM Drive Shaft - 58" - 330
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    MasterCraft OEM Drive Shaft - 58" - 330

    MasterCraft
    $1,491.95
    MasterCraft OEM Drive Shaft - 58" - 330 This drive shaft is measured to be 58inches long by 1-1/8inch in diameter with a 4inch coupler. Comes with a new prop nut and cotter pin.   **The images are of a MasterCraft Drive Shaft, however, the specific...
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    $1,491.95
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  • MasterCraft OEM Strut - 145 MasterCraft OEM Strut - 145
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    MasterCraft OEM Strut - 145

    MasterCraft
    $1,231.65
    MasterCraft OEM Strut - 145 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat dialed back...
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    $1,231.65
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  • MasterCraft OEM Drive Shaft 45.5" -327 MasterCraft OEM Drive Shaft 45.5" -327
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    MasterCraft OEM Drive Shaft 45.5" -327

    MasterCraft
    $539.63
    MasterCraft OEM Drive Shaft 45.5" -327 This genuine MasterCraft drive shaft is 45-1/2 inches long by 1-1/8 inch diameter and is splined. Comes with a new prop nut and cotter pin. Designed for boats with a splined drive shaft.   **The images are of a...
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    $539.63
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WaterSkis.com makes it easy to find the exact underwater gear your inboard boat needs—from drive shafts and struts to rudders and more. With parts for Mastercraft, Moomba, Supra, and other leading brands, our Boat Part Lookup Tool helps ensure a perfect fit every time. Looking to complete your repair? Explore propellers or steering components
 for a full performance upgrade.