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 13X16-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 OJ Prop 13X16-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X16-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X16-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | RH | 0.90 OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | RH | 0.90
    Quick view

    OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | RH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | RH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X14-4 Blade | Keyed | Bore 1" | RH | 0.90 OJ Prop 13X14-4 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 13X14-4 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X14-4 Blade | Keyed | Bore 1" | RH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X14-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X14-4 Blade | Keyed | Bore 1" | LH | 0.90 OJ Prop 13X14-4 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 13X14-4 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X14-4 Blade | Keyed | Bore 1" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X14-4 Blade | Splined | Bore 1 1/8" | LH | 0.90 OJ Prop 13X14-4 Blade | Splined | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X14-4 Blade | Splined | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
      OJ Prop 13X14-4 Blade | Splined | Bore 1 1/8" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X13-4 Blade | Keyed | Bore 1" | RH | 0.90 OJ Prop 13X13-4 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 13X13-4 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X13-4 Blade | Keyed | Bore 1" | RH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 13X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 OJ Prop 13X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 13X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 13X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 12.5X17-4 Blade | Keyed | Bore 1" | RH | 0.90 OJ Prop 12.5X17-4 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 12.5X17-4 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 12.5X17-4 Blade | Keyed | Bore 1" | RH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 12X14-4 Blade | Keyed | Bore 1" | LH | 0.90 OJ Prop 12X14-4 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 12X14-4 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 12X14-4 Blade | Keyed | Bore 1" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 12X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 OJ Prop 12X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 12X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 12X13-4 Blade | Keyed | Bore 1 1/8" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 12X13-4 Blade | Keyed | Bore 1" | RH | 0.90 OJ Prop 12X13-4 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 12X13-4 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 12X13-4 Blade | Keyed | Bore 1" | RH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 12X13-4 Blade | Keyed | Bore 1" | LH | 0.90 OJ Prop 12X13-4 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 12X13-4 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $544.00
    $531.25
    OJ Prop 12X13-4 Blade | Keyed | Bore 1" | LH | 0.90 Like its predecessor, The LEGEND 3-blade, The FORCE 4-BLADE is a strong and affordable performer. The FORCE 4-Blade was the first 4-blade introduced that provided the tournament tow boat a strong,...
    Add to Cart
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $544.00
    $531.25
    Subtotal:
    Add to Cart
  • OJ Prop 14X18-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 14X18-3 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X18-3 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: $517.00
    $461.55
    Subtotal:
    Add to Cart
  • OJ Prop 14X18-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 14X18-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X18-3 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: $517.00
    $461.55
    Subtotal:
    Add to Cart
  • OJ Prop 14X16-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90
    Quick view

    OJ Prop 14X16-3 Blade | Keyed | Bore 1 1/8" | LH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X16-3 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: $517.00
    $461.55
    Subtotal:
    Add to Cart
  • OJ Prop 14X16-3 Blade | Keyed | Bore 1 1/8" | RH | 0.90
    Quick view

    OJ Prop 14X16-3 Blade | Keyed | Bore 1 1/8" | RH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X16-3 Blade | Keyed | Bore 1 1/8" | RH | 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: $517.00
    $461.55
    Subtotal:
    Add to Cart
  • OJ Prop 14X16-3 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 14X16-3 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X16-3 Blade | Keyed | Bore 1" | RH | 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: $517.00
    $461.55
    Subtotal:
    Add to Cart
  • OJ Prop 14X16-3 Blade | Keyed | Bore 1" | LH | 0.90
    Quick view

    OJ Prop 14X16-3 Blade | Keyed | Bore 1" | LH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X16-3 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: $517.00
    $461.55
    Subtotal:
    Add to Cart
  • OJ Prop 14X14-3 Blade | Keyed | Bore 1" | RH | 0.90
    Quick view

    OJ Prop 14X14-3 Blade | Keyed | Bore 1" | RH | 0.90

    OJ Props
    MSRP: $517.00
    $461.55
    OJ Prop 14X14-3 Blade | Keyed | Bore 1" | RH | 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: $517.00
    $461.55
    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.