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Unique Seaflex Waterload Bag - 44,000 lbs (20,000 kg) Lift Capacity

SKU: SEF-20-WLB Rate this product


Availability: Contact us for availability

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  • High performance structural fabric canopy
  • All RF welded seams for strength and integrity
  • Webbing harness terminates with single steel lifting ring
  • Heavy duty UV stabilised PVC coating
  • Handling ladders
  • Versatile filling and discharge arrangement
  • Can be used singly or in clusters for load of up to 300t on one hook
  • 6:1 safety factor verified by National Engineering Laboratory Type Test


  • Lift: 44,000 lbs (20,000 kg)
  • Inflated Dimensions: 18.04 H X 10.5 Diameter Feet (5.5 H X 3.2 Diameter Meters)
  • Packed Dimensions: 3.94 L X 3.28 W X 1.8 H Feet (1.2 L X 1 W X 0.55 H Meters)
  • Weight: 352.74 lbs (160 kg)

Waterload Bag - 44,000 lbs (20,000 kg) Lift Capacity - P/N: SEF-20-WLB Includes:

  • 3 in. Diameter Layflat Discharge Hose with 3 in. BSP Stainless Steel Spigot on One End and Open on the Other End - Comes with Lanyard Tie-Off Points 23.1 feet (7 meters)
  • Filling Assembly - Light Alloy Swan Neck with 2.5 in Instantaneous Male Coupling
  • “J” Tube
  • Log Book
  • Certification
  • Instructions

Note: Each Waterload Bag comes in a transit case, however, if multiple bags are purchased, the vendor may consolidate the bags into one single larger case.


All Unique Seaflex Waterload Bags are constructed using procedures controlled by ISO 9001:2008 certified by Lloyds Register Quality Assurance and have passed the rigorous 6:1 type test at TUVNEL Ltd in Glasgow.

High quality performance fabrics, reliable HF welded seams and versatile filling/discharge arrangements are making Unique Seaflex WaterLoad Bags the first choice for increasing numbers of test houses world wide.

Capacities of 1 ton to 35 tons allow Unique Seaflex WaterLoad Bags to be used singly or in clusters to produce test loads of up to 300 tons on one hook. Multiple clusters can be used for higher loads.

While the water filled ballast bag concept is nothing new, several innovative features have been incorporated in Unique Seaflex WaterLoad Test Weights to make the user’s life easier. Unique Seaflex ‘J’ Tube arrangement can be positioned anywhere over the hem of the bag after attachment to the crane’s hook to prevent the risk of the fill hose being trapped between bags.

Filling is by 2½ inch full bore ‘fire hose’ terminating in quick release couplings compatible with standard hydrants. The invert of all units of 15 tons and above are fitted with 3 inch bronze camlock coupling to accept a 3 inch discharge hose which empties a 35 ton unit in 22 minutes. Similar 2 inch camlock fittings on all units up to and including 10 ton ensure minimum time wasted after the test.

Handling the larger units has been greatly eased by delivering them in their own dedicated storage boxes which allows the bag to be hoisted straight out of the box for filling, and when emptied, lowered and flaked back down with minimal site handling. This reduces the manpower required, reduces site time and keeps the bags protected at all times.

Note: Each Waterload Bag comes in a transit case, however, if multiple bags are purchased, the vendor may consolidate the bags into one single larger case.


Additional Information

Brand Unique Seaflex
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