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 13X12.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X12.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $872.96
    $763.60
    OJ Prop 13X12.5-3 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 an enhanced pitch distribution along with a new...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    Subtotal:
    Add to Cart
  • OJ Prop 13X12-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13X12-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $872.96
    $763.60
    OJ Prop 13X12-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    Subtotal:
    Add to Cart
  • OJ Prop 13X12-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X12-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $739.64
    $661.07
    OJ Prop 13X12-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90 The name speaks for itself. The original LEGEND is a design handed down from the originator, Oscar Johnson. This hand crafted 3-blade has been a consistent performer for many years. The LEGEND...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $739.64
    $661.07
    Subtotal:
    Add to Cart
  • OJ Prop 13X11.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $872.96
    $763.60
    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an enhanced pitch distribution along with a new...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    Subtotal:
    Add to Cart
  • OJ Prop 13X11.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X11.5-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $872.96
    $763.60
    OJ Prop 13X11.5-3 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 an enhanced pitch distribution along with a new...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    Subtotal:
    Add to Cart
  • OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $872.96
    $763.60
    OJ Prop 13X11-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110 By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The SkiPro propellers boast an enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    Subtotal:
    Add to Cart
  • 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: $872.96
    $763.60
    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 an enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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: $872.96
    $763.60
    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 an enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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: $872.96
    $763.60
    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 an enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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: $872.96
    $763.60
    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 enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    Subtotal:
    Add to Cart
  • OJ Prop 13X12-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

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

    OJ Props
    MSRP: $739.64
    $661.07
    OJ Prop 13X12-3 Blade | Keyed | Bore 1" | LH | 0.90 The name speaks for itself. The original LEGEND is a design handed down from the originator, Oscar Johnson. This hand crafted 3-blade has been a consistent performer for many years. The LEGEND 3-blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $739.64
    $661.07
    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: $872.96
    $763.60
    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 an enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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: $872.96
    $763.60
    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 enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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: $872.96
    $763.60
    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 enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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: $872.96
    $763.60
    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 enhanced pitch distribution along with a new blade...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $872.96
    $763.60
    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. Use the Parts Finder to select your year make and...
    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. Use the Parts Finder to select your year make and...
    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 Water Gear. Use the Parts Finder to select your year...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $514.24
    Subtotal:
    Add to Cart
  • 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 Gear. Use the Parts Finder to select your year make and...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $761.84
    Subtotal:
    Add to Cart
  • 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 Gear. Use the Parts Finder to select your year make and...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    $1,317.36
    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.