FATSAC

FATSAC Yamaha Jet Boat 21' Custom Ballast Bag - 725 lbs - Grey

Regular price $608.99 USD

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FATSAC grey custom ballast bag for Yamaha Jet Boat 21' model C1046
$608.99 USD
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FATSAC Yamaha Jet Boat 21' Custom Ballast Bag - 725 lbs - Grey


Description

The FATSAC Yamaha Jet Boat 21' Custom Ballast Bag is purpose-built to fit the swim deck of 21' and 20' 6" Yamaha Jet Boats, delivering a precise 725-pound ballast load for optimal wake performance. Engineered as a semi-custom fit, this grey PVC bag is designed to sit securely in place when properly installed and filled, giving riders the added weight they need for surfing and wakeboarding behind their Yamaha vessel.

All necessary fittings are included right out of the box, so you can get on the water without hunting down additional hardware. FATSAC's reputation for durable, performance-grade ballast bags is backed by this rugged construction - featuring welded PVC cleats and a thoughtfully designed filling system. Follow the included instructions and QR code video guides carefully to ensure a safe, warranty-backed installation every time.


Key Features

  • Yamaha-Specific Fit: Designed exclusively for the 21' Yamaha Jet Boat swim deck, compatible with 21' and 20' 6" models.
  • 725 lb Ballast Capacity: Delivers 725 pounds of water weight to enhance wake size and shape for surfing and wakeboarding.
  • Dimensions - 35" x 30" x 26": Precisely sized to sit flush and secure on the Yamaha swim deck when filled correctly.
  • All Fittings Included: Comes with W730, 2x W731, and W749 fittings - no additional hardware required.
  • 4 Welded PVC Cleats: Heavy-duty welded cleats on the bag allow for secure rope attachment to keep the bag locked in place.
  • Compatible with S7090 Fill/Empty Pump: Works with the FATSAC S7090 pump system to fill and drain the bag (pump sold separately).
  • Must Fill 100% with Water: Bag must be completely full to perform safely - partial filling can cause shifting, bag damage, and warranty void.
  • Rope Securing System: Requires a 12' or longer rope routed through cleats and handles on both the top and bottom of the bag for proper securing - see FATSAC M1028 dock line.
  • Air Bleed Valve: Fill with air first to position the bag, then pump with water and use the air release to purge all air for a complete, safe fill.
  • Grey Finish: Clean, neutral grey colorway designed to complement Yamaha Jet Boat aesthetics.

Shipping

Ships free! Please email us at service@omahasportsandgames.com for a delivery ETA or to confirm shipping details.


What's Included

  • FATSAC Yamaha Jet Boat 21' Custom Ballast Bag (Grey)
  • W730 fitting
  • W731 fittings (x2)
  • W749 fitting

Why You'll Love It

FATSAC has been a trusted name in wake ballast for years, and this custom bag is a prime example of why serious watersports enthusiasts rely on their products. The semi-custom fit for Yamaha Jet Boats means you're not wrestling with a generic sack that shifts and slips - this bag is made for your specific boat. With 725 pounds of ballast capacity, you'll notice a real difference in your wake size, giving surfers and wakeboarders more to work with on every run.

The included fitting hardware and detailed instruction videos make setup straightforward, even for first-time ballast users. Built from durable PVC with welded cleats, this bag is engineered to hold up season after season when used and installed correctly. Whether you're chasing a cleaner surf wake or looking to push your wakeboarding sessions to the next level, this ballast bag is a smart, boat-specific investment that delivers real results.


Product Specifications

View Product Specs
Model C1046
Compatible Boat Yamaha Jet Boat 21' (21' and 20' 6" models)
Ballast Weight 725 lbs
Dimensions 35" x 30" x 26"
Material PVC
Included Fittings W730, 2x W731, W749
Compatible Pump S7090 (sold separately)
Recommended Rope 12' or longer (M1028 dock line recommended, sold separately)
Color Grey

FAQ

What happens if I don't fill the bag 100% with water?

If the bag is not filled completely with water, it can shift on the swim deck and fall off the back of the boat - which is both dangerous and damaging. Partial filling also voids the warranty. Always fill the bag to 100% capacity, purging all air using the air release valve before use.

What boats is the C1046 ballast bag compatible with?

The C1046 is designed to fit the swim deck on Yamaha Jet Boats in the 21' and 20' 6" size range. It is a semi-custom fit, meaning it is not a universal bag - it is specifically shaped for this boat model.

Do I need to buy a pump separately?

Yes. The bag is compatible with the FATSAC S7090 pump to fill and empty the bag, but the pump is not included. You will need to purchase the S7090 separately to operate the ballast bag.

How do I properly secure the ballast bag?

Use a rope that is 12 feet or longer, routed through the welded PVC cleats and handles on both the top and bottom of the bag. The rope should be tied tightly around the bag itself - do not put any pulling tension directly on the cleats or handles. FATSAC recommends the M1028 heavy-duty marine dock line for this purpose.

What is the correct process for filling the bag?

First, fill the bag with air to give it shape and help you position it correctly on the swim deck. Once properly placed, use the pump to fill the bag with water. As water fills the bag, use the air release valve to bleed out any remaining air. Continue filling until the bag is 100% full with no air pockets remaining.

Will this void my warranty if I don't follow the instructions?

Yes. FATSAC explicitly states that not following the installation instructions and video guides will void the warranty. Be sure to review the instruction materials and QR code videos included with the bag before installation.


Product specifications table
Specification name Specification Value
Color pattern Gray

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