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 Evolution Prop 18X16-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Evolution Prop 18X16-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $1,173.00
    $997.08
    OJ Evolution Prop 18X16-4 Blade | Splined | Bore 1 1/8" | LH The OJ Evolution 3007-MF 4 Blade 18" X 16" LH 4-BLADE SPLINED BORE Propeller features a complete blade shape and pitch distribution redesign. Evolving from our successful WAKEPRO and V-4...
    Qty in Cart: 0
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    MSRP: $1,173.00
    $997.08
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  • OJ Evolution Prop 13X15-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Evolution Prop 13X15-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $613.00
    $521.05
    OJ Evolution Prop 13X15-4 Blade | Splined | Bore 1 1/8" | LH The OJ Evolution 3024-MF 4 Blade 13" X 15" LH 4-BLADE SPLINED BORE Propeller features a complete blade shape and pitch distribution redesign. Evolving from our successful WAKEPRO and V-4...
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    MSRP: $613.00
    $521.05
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  • MasterCraft OEM Rudder- 652

    MasterCraft OEM Rudder - 652

    MasterCraft
    $849.99
    MasterCraft OEM Rudder- 652 This genuine MasterCraft OEM Adjustable Prostar Rudder is model specific. If you have damaged your rudder it is typical that your Rudder Port is also damaged along with other Under Water Gear. Use the Parts Finder to select...
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    $849.99
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  • MasterCraft OEM Rudder Port - 208

    MasterCraft OEM Rudder Port - 208

    MasterCraft
    $349.99
    MasterCraft OEM Rudder Port - 208 This genuine MasterCraft OEM Rudder Port w/Grease Fitting 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...
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    $349.99
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  • MasterCraft OEM Rudder Port - 207

    MasterCraft OEM Rudder Port - 207

    MasterCraft
    $329.99
    MasterCraft OEM Rudder Port - 207 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...
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    $329.99
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  • MasterCraft OEM Rudder Port - 206

    MasterCraft OEM Rudder Port - 206

    MasterCraft
    $329.99
    MasterCraft OEM Rudder Port - 206 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...
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    $329.99
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  • MasterCraft OEM Rudder - 205

    MasterCraft OEM Rudder - 205

    MasterCraft
    $599.99
    MasterCraft OEM Rudder- 205 This genuine MasterCraft OEM 12" Bronze V-Drive Rudder is model specific. If you have damaged your rudder it is typical that your Rudder Port is also damaged along with other Under Water Gear. Use the Parts Finder to select...
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    $599.99
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  • MasterCraft OEM Drive Shaft 52.5" - 153

    MasterCraft OEM Drive Shaft 52.5" - 153

    MasterCraft
    $1,899.99
    MasterCraft OEM Drive Shaft 52.5" - 153 This genuine MasterCraft drive shaft is 52.5" x 1-1/4" diameter with coupler. This drive shaft is specifically designed for MasterCraft V-Drive boats. Comes with a new prop nut and cotter pin. Designed for boats...
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    $1,899.99
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  • MasterCraft Shaft Coupler Nut- 3/4"

    MasterCraft Drive Shaft Coupler Nut- 3/4"

    OJ Props
    $24.99
    MasterCraft Drive Shaft Coupler Nut- 3/4" 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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    $24.99
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  • Supra | Moomba Strut Bearing 1"

    Supra | Moomba Strut Bearing 1"

    Skiers Choice
    $114.99
    Supra | Moomba Strut Bearing 1" ***THESE ARE SOLD INDIVIDUALLY, YOU NEED TO ORDER QUANTITY OF 2 FOR ONE STRUT*** Strut Bearing for 1" strut - 2" Long Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba Boat...
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    $114.99
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  • MasterCraft Strut Bearing 1-1/8" | 206300

    MasterCraft 1-1/8" Strut Bearing | 206300

    MasterCraft
    $474.99
      MasterCraft Strut Bearing 1-1/8" | 206300 This is the replacement MasterCraft Strut Bushing/Bearing for a the 200399 1-1/8" strut. Used from 1982-2014. 2 Piece set. Use the boat part look up below to ensure you are purchasing the correct part for...
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    $474.99
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  • MasterCraft 1-1/8" Strut Bearing | 200137A

    MasterCraft 1-1/8" Strut Bearing | 200137A

    MasterCraft
    $350.99
    MasterCraft Strut Bearing 1-1/8" | 200137A This is the replacement MasterCraft Drive Shaft Strut Bushing/Bearing for a the 200136 and 200137 1-1/8" struts. 2 Piece set, Blue Super Slick. Use the boat part look up below to ensure you are purchasing the...
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    $350.99
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  • Mastercraft Nylon 9" T-Handle Drain Plug Assembly

    Mastercraft Nylon 9" T-Handle Drain Plug Assembly

    MasterCraft
    $64.99
    Mastercraft Nylon 9" T-Handle Drain Plug Assembly The 9" T-handle drain plug assembly is made of Nylon and is made for a marine environment and is a direct factory replacement for the deep hull X-Series MasterCrafts. Use the boat part look up below to...
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    $64.99
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  • MasterCraft OEM Rudder- 168

    MasterCraft OEM Rudder - 168

    MasterCraft
    $499.99
      MasterCraft OEM Rudder- 168 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...
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    $499.99
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  • Supra | Moomba Drive Shaft-42"x 1" | 914

    Supra | Moomba Drive Shaft-42"x 1" | 914

    Skiers Choice
    $579.99
    Supra | Moomba Drive Shaft-42"x1" | 914 This is a 42" 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. The...
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    $579.99
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  • Supra | Moomba Brass Shaft Log - Thru Hull

    Supra | Moomba Brass Shaft Log - Thru Hull

    Skiers Choice
    $89.99
    Supra | Moomba Brass Shaft Log - Thru Hull   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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    $89.99
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  • MasterCraft OEM Strut - Starboard - 102 MasterCraft OEM Strut - Starboard- 102

    MasterCraft OEM Strut - Starboard- 102

    MasterCraft
    $294.99
    MasterCraft OEM Strut - Starboard - 102 This genuine MasterCraft OEM Strut is model specific. Even a small bend in your strut can cause vibrations and long term damage to your drive shaft and possibly transmission. If you have a bent strut get your boat...
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    $294.99
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  • MasterCraft Boats Bearing- Strut 1" 6 Bolt

    MasterCraft Bearing- Strut 1" 6 Bolt

    MasterCraft
    $229.99
    MasterCraft Boats Bearing- Strut 1" 6 Bolt The MasterCraft Strut Bearing Bearing is a genuine MasterCraft boat part for boats with a 1" strut with a 6 Bolt Mounting Pattern.  If you are unsure of your boats drive shaft diameter please contact us...
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    $229.99
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  • Harmonic Prop Puller (Prop Knocker)

    Harmonic Prop Puller (Prop Knocker)

    OJ Props
    $39.99
    Harmonic Prop Puller (Prop Knocker) This is a Universal Harmonic Prop Puller and it will work with most major inboard and v drive boats including MasterCraft, Supra, Moomba, Nautique, and Malibu boats.   Don't let a bent prop ruin your weekend, this...
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    $39.99
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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.