Long, narrow in-floor compartments often end up empty and wasted during active summer runs, but the FatSac Tube Sac Ballast Bag converts that hidden hull area into a wave-shaping asset. FatSac specifically shaped this W704 Pro-X series long bladder with a slim 16-inch cross section to slip perfectly into restricted ski lockers or narrow side seat benches. Displacing 370 lbs of raw water weight in the mid-ship helps plane the hull out quickly, lengthening your wavesurf wave zone. The flat center leveling ensures wakeboarding transition paths stay long, clean, and highly predictable. Every crest lip clears beautifully.

The rugged exterior skin uses a proprietary, layered polyvinyl chloride fabric engineered to tolerate intense high-pressure hydraulic forces without expanding into an unstable log shape. High-frequency welded and seam-taped joints eliminate traditional splitting risks, keeping your internal stringer channels safe from high-volume water leaks. Inboard captains building an automated pumping loop match these inset valve ports with hardware from our boat wakeboard package sets inventory to optimize fill speeds. Four inset ports handle flexible hose routing.

Key Features of FatSac Tube Sac Ballast Bag

- 370 lbs Added Ballast: Adds 44 US gallons of dense water weight to counterbalance heavy stern engines and trim the boat plane.
- Long Narrow Profile Geometry: Measures 62 x 16 x 10 inches to slip easily inside restricted ski lockers or under narrow walkways.
- High-Frequency Pressure Welds: Fuses all structural fabric layers with taped burst-proof seam technology to handle rough compartment abrasion.
- 4 Inset Valve Ports: Outfits the skin with four separate port locations with 3/4-inch and 1-inch flow compatibility for versatile plumbing.
- Turnkey Fitting Kit Included: Packs essential high-flow fittings including two W731, one W749, and one W730 quick-twist connectors out of the box.
- High-Flow Pump Ready: Links directly with Supa Pump 3.0 and Supa Tsunami high-speed portable ballast systems for rapid lake fill cycles.
- Commercial Marine Grade Body: Formulates the heavy vinyl exterior to resist sun baking, compartment scratches, and toxic under-seat fuel fumes.
- USA Handmade Precision: Constructs every ballast sac by hand in the USA to guarantee industry-leading material strength and zero factory leaks.

Ski Locker Ballast Optimization & Hull Plane Control

This 370 lbs narrow tube sac serves as the industry standard for stabilizing lightweight mid-ship sections against massive rear plug-and-play locker tanks. Forcing the center belly deeper flattens your boat’s tracking stance, trimming the hull to generate long, steep wave faces.

Our pro shop crew put this narrow tube bag inside a cramped center floor ski locker to test water evacuation speeds. The four inset valve ports are an awesome asset, letting us bleed out trapped air lines instantly on the platform without kinking hoses under the deck. It held its pressure perfectly all day, adding serious mid-ship weight that smoothed out our wakeboarding wake.

Why Choose FatSac Tube Sac Ballast Bag

Standard bulky ballast bladders bunched into narrow lockers crease, pinch, and split along the corners when the hull hits heavy lake chop, dumping hundreds of gallons inside your bilge. The FatSac Tube sac prevents this expensive damage by packing a slim silhouette and commercial-grade polyvinyl skin together, protecting your boat plumbing budget.

Factory Warranty & Professional Care Guidelines

FatSac protects this Pro-X series sac with an official 1 Year Limited Manufacturer Warranty covering material and bonding defects. To keep the polyvinyl fabric flexible and protect the valve ports, rinse off lake muck after use. Store the bladder completely dry inside a dark locker.