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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  • UW Gear Screw 2"

    MasterCraft
    $1.99
      UW Gear Screw 2" Genuine MasterCraft underwater gear screw 2" in length.  
    Qty in Cart: 0
    Quantity:
    Price:
    $1.99
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  • Supra | Moomba Strut Bearing 1-1/8"

    Supra | Moomba Strut Bearing 1-1/8"

    Skiers Choice
    $219.99
    Supra | Moomba Strut Bearing 1-1/8" Strut Bearing for 1-1/8" strut - 4.5" Long (2 pieces 2.25"). Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba Boat.  
    Qty in Cart: 0
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    Price:
    $219.99
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  • Supra | Moomba Drive Shaft-44.5"x 1" | 915

    Supra | Moomba Drive Shaft-44.5"x 1" | 915

    Skiers Choice
    $699.99
    Supra | Moomba Drive Shaft-44.5"x1" | 915 This is a Supra and Moomba Boats 44.5" Drive Shaft x 1" diameter. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce vibration. The...
    Qty in Cart: 0
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    $699.99
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  • UW Gear Screw 2-1/2"

    MasterCraft
    $1.99
    UW Gear Screw 2-1/2" Genuine MasterCraft underwater gear screw 2-1/2" in length.  
    Qty in Cart: 0
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    Price:
    $1.99
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  • Anode- Aluminum Transom 5.75 X 2

    MasterCraft
    $29.99
    Anode- Aluminum Transom 5.75 X 2 Anode- Aluminum Transom 5.75 X 2 Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
    Qty in Cart: 0
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    $29.99
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  • Just-In-Case Prop Kit - 15" Puller Hard Case Just-In-Case Prop Kit - 15" Puller Hard Case

    Just-In-Case Prop Kit - 15" Puller Hard Case

    OJ Props
    $319.00
    OJ Prop Just-In-Case Prop Kit - 15" Puller Hard Case This kit contains all you need to replace a damaged propeller, including a 3/4″ brass Nylock prop nut, brass key, stainless steel cotter pin, Stainless Steel Powder Coated Prop Puller, machined...
    Qty in Cart: 0
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    Price:
    $319.00
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  • OJ Just-In-Case Prop Kit - 18" Knocker Hard Case Add a Product - Just-In-Case Prop Kit - 18" Knocker Hard Case

    Just-In-Case Prop Kit - 18" Knocker Hard Case

    OJ Props
    $268.00
    Just‑In‑Case Prop Kit – 18″ Knocker Hard Case Don't be caught dead in the water—this fully loaded prop kit ensures you're prepared for prop emergencies up to 18″ diameter. Housed in a rugged, waterproof hard case, the kit...
    Qty in Cart: 0
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    $268.00
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  • OJ Prop 15X13.5-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Prop 15X13.5-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $828.00
    $725.05
    OJ Prop 15X13.5-4 Blade | Splined | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-4 propellers boast an enhanced pitch distribution along with a new...
    Qty in Cart: 0
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    MSRP: $828.00
    $725.05
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  • OJ Prop 15X14.5-4 Blade | Splined | Bore 1 1/8" | LH (1816-MF)

    OJ Prop 15X14.5-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $828.00
    $725.05
    OJ Prop 15X14.5-4 Blade | Splined | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-4 propellers boast an enhanced pitch distribution along with a new...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $828.00
    $725.05
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  • OJ Prop 13.5X16-4 Blade | Keyed | Bore 1 1/8" | LH (437-MF)

    OJ Prop 13.5X16-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $641.00
    $561.00
    OJ Prop 13.5X16-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-3 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
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    MSRP: $641.00
    $561.00
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  • OJ Prop 15X13.5-4 Blade | Keyed | Bore 1 1/8" | LH (1921-MF)

    OJ Prop 15X13.5-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $828.00
    $725.05
    OJ Prop 15X13.5-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-4 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $828.00
    $725.05
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  • OJ Prop 16X15-4 Blade | Keyed | Bore 1 1/8" | LH (963-MF)

    OJ Prop 16X15-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $1,048.00
    $917.15
    OJ Prop 16X15-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-3 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,048.00
    $917.15
    Subtotal:
  • OJ Prop 15X12-4 Blade | Keyed | Bore 1 1/8" | LH (1997-MF)

    OJ Prop 15X12-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $828.00
    $725.05
    OJ Prop 15X12-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-4 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $828.00
    $725.05
    Subtotal:
  • OJ Prop 15X16.25-4 Blade | Keyed | Bore 1 1/8" | LH (1925-MF)

    OJ Prop 15X16.25-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $828.00
    $725.05
    OJ Prop 15X16.25-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-4 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $828.00
    $725.05
    Subtotal:
  • OJ Prop 15X14.5-4 Blade | Keyed | Bore 1 1/8" | LH (1916-MF)

    OJ Prop 15X14.5-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $828.00
    $725.05
    OJ Prop 15X14.5-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-4 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $828.00
    $725.05
    Subtotal:
  • OJ Prop 16X14-4 Blade | Keyed | Bore 1 1/8" | LH (964-MF)

    OJ Prop 16X14-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $1,048.00
    $917.15
    OJ Prop 16X14-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-3 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,048.00
    $917.15
    Subtotal:
  • OJ Prop 16X13-4 Blade | Keyed | Bore 1 1/8" | LH (960-MF)

    OJ Prop 16X13-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $1,048.00
    $917.15
    OJ Prop 16X13-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-3 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,048.00
    $917.15
    Subtotal:
  • OJ Prop 16X17-4 Blade | Keyed | Bore 1 1/8" | LH (967-MF)

    OJ Prop 16X17-4 Blade | Keyed | Bore 1 1/8" | LH

    OJ Props
    MSRP: $1,048.00
    $917.15
    OJ Prop 16X17-4 Blade | Keyed | Bore 1 1/8" | LH By refining OJ Propellers original superior design, they have produced their finest performing line of propellers. The Wakepro V-3 propellers boast an enhanced pitch distribution along with a new blade...
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $1,048.00
    $917.15
    Subtotal:
  • Supra | Moomba Tracking Fin | 296 Supra | Moomba Tracking Fin | 296

    Supra | Moomba Tracking Fin | 296

    Skiers Choice
    $299.99
    Supra | Moomba Tracking Fin 113296 If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement.  Fin, Tracking, 11-9/16 Long Use the Boat Part Lookup to ensure you are getting...
    Qty in Cart: 0
    Quantity:
    Price:
    $299.99
    Subtotal:
  • Supra | Moomba Rudder Assembly | 080

    Supra | Moomba Rudder Assembly | 080

    Skiers Choice
    $1,099.99
    Supra | Moomba Rudder Assembly | 117080 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. Rudder Assembly Kit 105 degree, with tuning bar. Use the Boat Part Lookup to ensure you are getting the correct part for your...
    Qty in Cart: 0
    Quantity:
    Price:
    $1,099.99
    Subtotal:
  • Total: items /

Adding your products to cart

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.