Dock Floats & Air Tanks

Dock Floats & Air Tanks by Ace offers both rotationally molded and blow-molded designs. With over 70 different sizes available, from one to four feet wide, three to eight feet long, and eight to thirty-six inches high, you are sure to find an Ace float drum that fits your needs, whether you are a private dock builder or a contractor for a large marina complex.

Ace offers a 15-Year Float Drum Warranty on all of its manufactured float drums to the original owner.

The interior of the float drum is filled with expanded polystyrene (EPS) foam. The foam is steam pressured for a tight fit that provides the highest buoyancy possible. The foam interior provides floatation if the outside shell becomes punctured and is continually tested to meet or exceed the Hunt Water Absorption Test standard of 3 lbs per cubic foot. The “Falling Dart” test and ultrasonic wall thickness testing are part of Ace Roto-Mold’s quality procedures to ensure the durable, long life of our float drums.

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Air Tanks by Ace Roto-Mold


Boat Lift / Air Tank Floats General Information

  • Molded-in mounting holes in the top of the drum
  • A large molded-in hole in the bottom for water intake and exhaust
  • Threaded inserts for commercial fittings
  • Heavy 3/8″ wall thickness for structural strength
  • The top has molded-in grooves for mounting to lift
  • Now available with a square bottom

When looking at tank sizes, the first number is the height, the second number is the width, and the third number is the length.

Float Drums by Ace Roto-Mold


Float drums are the essential component of your floating dock. These float drums keep the dock floating. Most important is how well these drums perform (see more on the technical and performance specs in the full description below.)

Our float drums come in 19 different sizes from 12″ x 48″ up to 48″ x 120″ with many depth choices depending upon the model you choose.

Drums come in black.

When looking at drum sizes, the first number is the width, the second number is the length, and the third number is the height.