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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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  • OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90 OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X12.5-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 13X12.5-3 Blade | Keyed | Bore 1" | LH | 0.110

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X12.5-3 Blade | Keyed | Bore 1" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X12.5-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 13X12.5-3 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X12.5-3 Blade | Keyed | Bore 1" | LH | 0.90 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X12-3 Blade | Keyed | Bore 1" | LH | 0.110
    Quick view

    OJ Prop 13X12-3 Blade | Keyed | Bore 1" | LH | 0.110

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X12-3 Blade | Keyed | Bore 1" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X11.5-3 Blade | Keyed | Bore 1" | LH | 0.110
    Quick view

    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1" | LH | 0.110

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X11.5-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1" | LH | 0.90 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X11-3 Blade | Keyed | Bore 1" | LH | 0.110
    Quick view

    OJ Prop 13X11-3 Blade | Keyed | Bore 1" | LH | 0.110

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X11-3 Blade | Keyed | Bore 1" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • OJ Prop 13X11-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 13X11-3 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $952.32
    $809.47
    OJ Prop 13X11-3 Blade | Keyed | Bore 1" | LH | 0.90 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $952.32
    $809.47
    Subtotal:
    Add to Cart
  • Quick view

    MasterCraft OEM Tracking Fin - 654

    MasterCraft
    $317.42
    MasterCraft OEM Tracking Fin- 654 This genuine MasterCraft OEM Tracking is model specific. If you have damaged your rudder Tracking Fin it is typical that you have with other Under Water Gear damage...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $317.42
    Subtotal:
    Add to Cart
  • Quick view

    MasterCraft OEM Tracking Fin - 653

    MasterCraft
    $206.32
    MasterCraft OEM Tracking Fin- 653 This genuine MasterCraft OEM Tracking is model specific. If you have damaged your rudder Tracking Fin it is typical that you have with other Under Water Gear damage...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $206.32
    Subtotal:
    Add to Cart
  • MasterCraft OEM Rudder Port- 174
    Quick view

    MasterCraft OEM Rudder Port - 174

    MasterCraft
    $514.24
    MasterCraft OEM Rudder Port- 174 This genuine MasterCraft OEM Rudder Port is model specific. If you have damaged your rudder Port it is typical that your Rudder is also damaged along with other Under...
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    Qty in Cart: 0
    Quantity:
    Price:
    $514.24
    Subtotal:
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  • MasterCraft OEM Rudder MasterCraft OEM Rudder
    Quick view

    MasterCraft OEM Rudder - 657

    MasterCraft
    $761.84
    MasterCraft OEM Rudder- 657 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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $761.84
    Subtotal:
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  • MasterCraft OEM Rudder MasterCraft OEM Rudder
    Quick view

    MasterCraft OEM Rudder - 651

    MasterCraft
    $1,317.36
    MasterCraft OEM Rudder- 651 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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $1,317.36
    Subtotal:
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  • MasterCraft OEM Rudder MasterCraft OEM Rudder
    Quick view

    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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $1,190.38
    Subtotal:
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  • MasterCraft OEM Rudder MasterCraft OEM Rudder
    Quick view

    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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $1,864.94
    Subtotal:
    Add to Cart
  • MasterCraft OEM Strut MasterCraft OEM Strut
    Quick view

    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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $825.33
    Subtotal:
    Add to Cart
  • MasterCraft OEM Strut MasterCraft OEM Strut
    Quick view

    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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $753.90
    Subtotal:
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  • MasterCraft OEM Strut MasterCraft OEM Strut - 195
    Quick view

    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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $1,111.02
    Subtotal:
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  • MasterCraft OEM Drive Shaft 54.25"- 348 MasterCraft OEM Drive Shaft 54.25"- 348
    Quick view

    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...
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    Qty in Cart: 0
    Quantity:
    Price:
    $2,174.45
    Subtotal:
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  • MasterCraft OEM Drive Shaft 52.5" - 345 MasterCraft OEM Drive Shaft 52.5" - 345
    Quick view

    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...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $2,142.70
    Subtotal:
    Add to Cart
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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.