Three reversible ballast pumps: Enables independent filling and draining for each ballast bag, reducing priming and fill time
Dedicated vent and overflow connections: Ensures consistent, reliable operation and prevents airlocks
Reused factory components: Minimizes installation effort and maintains compatibility with original boat hardware
Pre-wired switch block and battery terminal modules: Simplifies wiring and ensures safe, easy setup
Tested installation process: Provides confidence and reliability for users
Unfortunately, it's well known that the factory Gravity III ballast system installed in 2002-2008 Moomba and Supra boats has numerous flaws in terms of its design and functionality. Going back more than three years ago we pioneered the first Gravity III Ballast System Upgrade, and since then we've helped lots of unhappy owners fix the iss
Compatible Watercraft
Supra and Moomba boats (2009+ factory system)
Included Pumps
3 WakeMAKERS premium reversible ballast pumps
Wiring Harnesses
20 ft pump harness, 10 ft battery harness
Hose
1 ballast hose, 1 1 1/8 in stainless steel hose clamps, 3/4 in thread x 1 hose barb fittings
Valves
3/4 in bronze ball valves
Intakes
3/4 in bronze mushroom thru-hull intakes
4.7
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A MUST for anyone frustrated with the GGIII system
The kit install was pretty straightforward. The most important part about the install, is the 30ft of hose included is intended to go under the floor to the bow bag. I mounted the pump for the bow bag on the V Drive/transmission. And i ran the hose around the port side to the bow and into the locker. Doing it like this will use up almost all of your hose so I ordered an additional 30ft of hose. I bought a couple fittings from my local hardware store and Amazon to make things neat and tidy. Another important part is the glued in fittings on oem fly high bags. I removed all the fittings with a hairdryer and my foot. I re sealed around the threaded holes with e6000 adhesive. I Tefloned all threads into the bags and cleaned all the o rings. I have the bottom port as fill/drain. Capped the upper port, and put the vent line at the far end of each bag. My system fills the fastest it ever has and the bags are the fullest they've ever been. Best wave I've ever had with my 08 xlv. 10/10 kit would reccomend
N
Nicholas · June 27, 2025
Grav 3 Ballast System Upgrade
Everything was great, service great, installed as it should, only negative was the instructional video and info do not mention at all the front stock ballast bag. Messing with this bag and plumbing a 1" line required taking up the floor, not a huge deal, but also my stock bags have a glued in barb for a 3/4" line, and removing that from the bag can damage the bag requiring replacement. I did find a wakemakers video on removing them after some searching, but was not aware of this issue at time of purchase. Also, the stock bag fill and drain barbs are on the same end of the bag, making using one of them as a vent really not practical, if you swing the bag so the vent is on the high side (towards the bow), then the fill/drain is on the high side as well, and draining the bag is difficult. Leave it on the low (aftward) side of the boat, then the vent doesn't really act as a vent. More discussion on this issue, and perhaps just suggesting a replacement bag size and configuration would be helpful. Great products though, great service, fast delivery.