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 13.7X17-4 Blade | Keyed | Bore 1 1/8" | RH | 0.110
    Quick view

    OJ Prop 13.7X17-4 Blade | Keyed | Bore 1 1/8" | RH | 0.110

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X17-4 Blade | Keyed | Bore 1 1/8" | RH | 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13.7X17-4 Blade | Keyed | Bore 1" | RH | 0.110
    Quick view

    OJ Prop 13.7X17-4 Blade | Keyed | Bore 1" | RH | 0.110

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X17-4 Blade | Keyed | Bore 1" | RH | 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13.7X17-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13.7X17-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X17-4 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13.7X15.5-4 Blade | Keyed | Bore 1 1/8" | RH | 0.90
    Quick view

    OJ Prop 13.7X15.5-4 Blade | Keyed | Bore 1 1/8" | RH | 0.90

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X15.5-4 Blade | Keyed | Bore 1 1/8" | RH | 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13.7X15.5-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13.7X15.5-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X15.5-4 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13.7X15-4 Blade | Splined | Bore 1 1/8" | LH | 0.110 OJ Prop 13.7X15-4 Blade | Splined | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13.7X15-4 Blade | Splined | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X15-4 Blade | Splined | 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13.7X15-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13.7X15-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.7X15-4 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: $641.00
    $561.00
    Subtotal:
    Add to Cart
  • OJ Prop 13X17.5-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13X17.5-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 13X17.5-4 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 13X15.5-4 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 13X15.5-4 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 13X15.5-4 Blade | Keyed | Bore 1" | RH | 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 13.5X15.5-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13.5X15.5-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props

    MSRP: $595.00
    $521.05
    OJ Prop 13.5X15.5-4 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X13-4 Blade | Splined | Bore 1 1/8" | LH | 0.90 OJ Prop 12.5X13-4 Blade | Splined | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 12.5X13-4 Blade | Splined | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 12.5X13-4 Blade | Splined | 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X12-4 Blade | Splined | Bore 1 1/8" | LH | 0.90 OJ Prop 12.5X12-4 Blade | Splined | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 12.5X12-4 Blade | Splined | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 12.5X12-4 Blade | Splined | 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 12.5X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 12.5X13-4 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X12-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 12.5X12-4 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 12.5X12-4 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X13-4 Blade | Keyed | Bore 1" | LH | 0.110
    Quick view

    OJ Prop 12.5X13-4 Blade | Keyed | Bore 1" | LH | 0.110

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 12.5X13-4 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X12-4 Blade | Keyed | Bore 1" | LH | 0.110
    Quick view

    OJ Prop 12.5X12-4 Blade | Keyed | Bore 1" | LH | 0.110

    OJ Props
    MSRP: $595.00
    $521.05
    OJ Prop 12.5X12-4 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: $595.00
    $521.05
    Subtotal:
    Add to Cart
  • OJ Prop 14X13-3 Blade | Splined | Bore 1 1/8" | LH | 0.110 OJ Prop 14X13-3 Blade | Splined | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 14X13-3 Blade | Splined | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $588.00
    $514.25
    OJ Prop 14X13-3 Blade | Splined | 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: $588.00
    $514.25
    Subtotal:
    Add to Cart
  • OJ Prop 13.4X10-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13.4X10-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $588.00
    $514.25
    OJ Prop 13.4X10-3 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: $588.00
    $514.25
    Subtotal:
    Add to Cart
  • OJ Prop 14X13-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 14X13-3 Blade | Keyed | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $588.00
    $514.25
    OJ Prop 14X13-3 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: $588.00
    $514.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X13-3 Blade | Splined | Bore 1 1/8" | LH | 0.110 OJ Prop 13X13-3 Blade | Splined | Bore 1 1/8" | LH | 0.110
    Quick view

    OJ Prop 13X13-3 Blade | Splined | Bore 1 1/8" | LH | 0.110

    OJ Props
    MSRP: $550.00
    $481.10
    OJ Prop 13X13-3 Blade | Splined | 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: $550.00
    $481.10
    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.