Balancing out heavy aft weight on narrow inboard vessels is exceptionally difficult, but the dual FatSac Side Sac Set Ballast kit provides the slim footprint needed to optimize tight engine bays. FatSac engineered this matching pair of narrow side bladders to slip easily into the restricted compartments flanking direct-drive engine boxes or tight bow walkways. Displacing a combined 520 lbs of water ballast, this twin pack lets you equalize your port and starboard tracking planes perfectly. Hull lean is managed. Your wakesurf wave face shapes up with total symmetry.

This industrial twin skin utilizes a proprietary, layered heavy-duty Valmex polyvinyl chloride fabric built to withstand raw friction against raw fiberglass stringers. High-frequency welded and seam-taped seams eliminate standard puncture splits and abrasion failures when stuffed into tight spaces. Wake captains setting up custom, high-speed automated lines match these multi-port valves with hardware from our boat wakeboard package sets catalog to quicken fill times. Quick-twist adapters prevent line kinking.

Key Features of FatSac Side Sac Set Ballast

- 520 lbs Combined Weight Pack: Adds 260 lbs of dense water weight per sac to let you micro-adjust the port or starboard lean of your boat hull.
- Slim 12-Inch Cross Section: Sized at 48 x 12 x 12 inches per sac to slide effortlessly into tight engine bays and narrow under-seat lockers.
- Valmex Heavy-Duty Polyvinyl: Formulates an ultra-rugged marine fabric skin that delivers extreme resistance against puncture dings and rail scuffs.
- Welded & Seam-Taped Joints: Fabricates every structural joint with high-frequency pressure welding to deliver an absolute burst-proof rating.
- Multi-Port Valve Architecture: Outfits each bag with multiple inset locations to support clean, dual-pump ventilation and drainage routing.
- Supa Tsunami Fast Connect: Links directly with Supa Tsunami quick-twist fittings and standard high-flow portable ballast pumps for fast fill cycles.
- UV Stabilized Protective Coat: Protects the vinyl skin from sun degradation and chemical engine fuel fumes inside dark motor compartments.
- USA Commercial Fabrication: Constructs every dual pack by hand in the USA to ensure professional marine-grade material strength and long life.

Narrow Profile Advantage & Dual Mid-Ship Weight Equalization

This matching side sac pair functions as the ultimate fine-tuning weapon for direct-drive boat owners who need to weight the mid-ship area without cluttering the main cabin deck. Splitting the weight along the gunwales shapes clean wave lips on either side.

Our road crew loaded this matching pair of side sacs into the narrow compartments flanking a direct-drive engine block. The slim 12-inch profile is a major asset; both bags slid into place without rubbing against moving belts. Filling them completely equalized our hull stance, removing the messy wash spray from the wave lip within minutes.

Why Choose FatSac Side Sac Set Ballast

Standard bulky ballast bladders bunched into narrow motor compartments press against hot engine blocks and raw exhaust manifolds, leading to melted vinyl and flooded bilges. The FatSac Side Sac set prevents this dangerous damage by packing a slim silhouette and chemical-resistant Valmex skin together, protecting your boat plumbing budget.

Factory Warranty & Professional Care Guidelines

FatSac protects this matching twin set with an official 1 Year Limited Manufacturer Warranty covering material and bonding defects. To keep the Valmex polyvinyl flexible and ensure clean pumping performance, clear away raw oil or fuel fumes from the skin after use. Always store the pair dry.