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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  • Supra | Moomba Rudder Assembly | 202

    Supra | Moomba Rudder Assembly | 202

    Skiers Choice
    $1,849.99
    Supra | Moomba Rudder Assembly | 115202 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. Rudder Assembly Kit 105 degree, no tuning wing. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra...
    Qty in Cart: 0
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    $1,849.99
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  • Supra | Moomba Rudder Assembly | 135 (113135) Supra | Moomba Rudder Assembly | 135 (113135)

    Supra | Moomba Rudder Assembly | 135

    Skiers Choice
    $1,399.99
    Supra | Moomba Rudder Assembly | 113135 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. Rudder Assembly Kit. 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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    $1,399.99
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  • Supra | Moomba Rudder Assembly | 281

    Supra | Moomba Rudder Assembly | 281

    Skiers Choice
    $699.99
    Supra | Moomba Rudder Assembly | 108281 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. Rudder Assembley Kit, Large (V Drive) Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba...
    Qty in Cart: 0
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    $699.99
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  • Supra | Moomba Strut - 15 deg. 1 1/8" | 127

    Supra | Moomba Strut - 15 deg. 1 1/8" | 127

    Skiers Choice
    $399.99
    Supra | Moomba Strut-15 Degree 1 1/8" | 117127 This is a 15 Degree Strut for a 1 1/8" shaft for Supra and Moomba Boats. 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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    $399.99
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  • Supra | Moomba Strut - 14 deg. 1" | 030 (101030)

    Supra | Moomba Strut - 14 deg. 1" | 030

    Skiers Choice
    $414.99
    Supra | Moomba Strut-14 Degree 1" | 101030 This is a 14 Degree Strut for a 1" shaft for Supra and Moomba Boats. 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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    $414.99
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  • Supra | Moomba Drive Shaft-48" | 100918

    Supra | Moomba Drive Shaft-48" | 100918

    Skiers Choice
    $599.99
    Supra | Moomba Drive Shaft-48" w/4 Coupler | 100918 This is a 48" Drive Shaft by 1" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce vibration...
    Qty in Cart: 0
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    $599.99
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  • Supra | Moomba Drive Shaft-54.75"x 1-1/8" | 855

    Skiers Choice
    $1,199.99
    Supra | Moomba Drive Shaft-54.75"x1-1/8" | 119855 This is a 54.75" Drive Shaft by 1-1/8" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce...
    Qty in Cart: 0
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    $1,199.99
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  • Supra | Moomba Drive Shaft-52.75"x 1-1/8" | 273

    Skiers Choice
    $729.99
    Supra | Moomba Drive Shaft-52.75"x1-1/8" | 273 This is a 52.75" Drive Shaft by 1-1/8" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce...
    Qty in Cart: 0
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    $729.99
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  • Supra | Moomba Drive Shaft-54.75"x 1-1/8" | 300

    Skiers Choice
    $799.99
    Supra | Moomba Drive Shaft-54.75"x1-1/8" | 263 This is a 54.75" Drive Shaft by 1-1/8" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce...
    Qty in Cart: 0
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    $799.99
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  • Supra | Moomba Drive Shaft - 51"x1-1/8"

    Supra | Moomba Drive Shaft-51"x 1-1/8" | 646

    Skiers Choice
    $745.99
    Supra | Moomba Drive Shaft - 51"x1-1/8" | 646 This is a 51" Drive Shaft by 1-1/8" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce...
    Qty in Cart: 0
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    $745.99
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  • Supra | Moomba Drive Shaft-46.75"x 1-1/8" | 787

    Supra | Moomba Drive Shaft-46.75"x 1-1/8" | 787

    Skiers Choice

    $599.99
    Supra | Moomba Drive Shaft-46.75"x1-1/8" | 787 This is a 46.75" Drive Shaft by 1-1/8" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce...
    Qty in Cart: 0
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    $599.99
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  • Supra | Moomba Drive Shaft-50"x 1-1/8" | 356

    Supra | Moomba Drive Shaft-50"x 1-1/8" | 356

    Skiers Choice
    $794.99
    Supra | Moomba Drive Shaft-50"x1-1/8" | 356 This is a 50" Drive Shaft by 1-1/8" diameter for Supra and Moomba Boats. ***Skier’s Choice couplers are pressed onto the shaft and the assembly is CNC balanced to improve performance and reduce vibration...
    Qty in Cart: 0
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    $794.99
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  • Supra | Moomba Strut-15.5 Degree 1" | 102

    Supra | Moomba Strut - 15.5 deg. 1" | 102

    Skiers Choice
    $444.99
    Supra | Moomba Strut-15.5 Degree 1" | 102 This is a 15.5 Degree Strut for a 1" shaft for Supra and Moomba Boats. 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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    $444.99
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  • Supra | Moomba Strut - 15 deg. 1-1/8" | 029

    Supra | Moomba Strut - 15 deg. 1-1/8" | 029

    Skiers Choice
    $399.99
    Supra | Moomba Strut-15 Degree 1-1/8" | 029 This is a 15 Degree Strut for a 1-1/8" shaft for Supra and Moomba Boats. 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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    $399.99
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  • Supra | Moomba Strut - 15 deg. 1" | 082

    Supra | Moomba Strut - 15 deg. 1" | 082

    Skiers Choice
    $409.99
    Supra | Moomba Strut-15 Degree 1" | 082 This is a 15 Degree Strut for a 1" shaft for Supra and Moomba Boats. 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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    $409.99
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  • Supra | Moomba Rudder Assembly | 072

    Supra | Moomba Rudder Assembly | 072

    Skiers Choice
    $899.99
    Supra | Moomba Rudder Assembly | 072 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. This is the New 105 Degree, No Tuning Bar rudder assembly. Use the Boat Part Lookup to ensure you are getting the correct part for your...
    Qty in Cart: 0
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    $899.99
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  • 10" Supra | Moomba Tracking Fin (Long)

    Supra | Moomba 10" Tracking Fin | 128

    Skiers Choice
    $359.99
    10" Supra | Moomba Tracking Fin (Long) If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and...
    Qty in Cart: 0
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    $359.99
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  • Supra | Moomba 10" Tracking Fin | 226

    Skiers Choice
    $244.99
    10" Supra | Moomba Tracking Fin If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba...
    Qty in Cart: 0
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    $244.99
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  • Supra | Moomba 7" Tracking Fin | 225

    Skiers Choice
    $174.99
    7" Supra | Moomba Tracking Fin If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement. 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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    $174.99
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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.