WakeBallast Supra/Moomba Gravity III Ballast System Enhancer

Complete ballast system overhaul for 2002–2008 Supra and Moomba boats equipped with the factory Gravity III system. If you own one of these boats, you already know the problems — slow fills, priming issues, inconsistent drain times, and a single shared pump splitting output across three bags. This kit fixes all of it.

The upgrade replaces the factory single common fill pump with three dedicated reversible pumps — one per bag. Each bag gets the full output of its own pump for filling and draining. No more waiting for one compartment to finish before the next one starts cooperating. Fill faster, drain cleaner, and stop nursing a system that was never designed to keep up with how you actually use the boat.

After installation, your factory ballast system essentially functions like the 2009+ factory setup: dedicated reversible pump per bag, dedicated vent/overflow connection per bag, and operation through your existing factory dash switches. More weight, less wait, zero drama.

What's Included

• Three reversible ballast pumps (one per bag location)
• All hose, fittings, and hardware for complete installation
• Wiring harness to connect to factory switches
• Thru-hull fittings for vent/overflow connections

How It Works

The factory Gravity III uses a single common fill pump whose output is split three ways — a massive bottleneck. This kit replaces that single pump with three independent reversible pumps. Each bag fills and drains on its own circuit with its own dedicated vent/overflow line. The result is dramatically faster cycle times and a system that works the way it should have from the factory.

Installation

• Difficulty: Moderate — basic hand tools, wiring, and drilling required
• Drilling: Yes — additional thru-hull holes are required. If you can use a drill and a hole saw, you can handle it. If you'd rather not, any marine service shop can do it.
• Controls: Wires to your existing factory dash switches — no new switches needed
• View Full Installation Guide →

Fitment

• 2002–2008 Supra (various models with Gravity III system)
• 2002–2008 Moomba (various models with Gravity III system)

Bag Compatibility

Select the option that matches the bags currently installed in your boat. The kit includes the correct fittings and hose connections for factory bags and aftermarket replacements.

Warranty & Origin

Assembled and shipped from Chandler, Arizona. Backed by WakeBallast's 2-year limited warranty .

Supra and Moomba are registered trademarks of their respective owners and are used for fitment reference only.