Rockacy and Associates, Inc.

Pronal USA

Pronal-USA, Inc. is a subsidiary of Pronal S.A.S. in Leers, France. Pronal has been in business for over 50 years and has been developing know-how and expertise in designing and manufacturing of flexible structures, bladders and bags made of a variety of elastomers, plastomers and composites.

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Wide Range of Products

We offer a wide range of products extending from Flexible Tanks for storage and transportation of most any type of liquid, Flexible Lifting Bags and Cushions, Pipe Plugs and Stoppers, Hydraulic Oil Compensators, Aircraft Lift Bags for disabled aircraft recovery, as well as many other custom designed products.


Global Customers

Today, more than 3,000 global customers rely on Pronal to provide solutions for Design Projects in a variety of fields, including Military, Aerospace, Fire Rescue, Offshore, Industrial/Mechanical, Hydraulic, Nuclear, and Environmental. Since 1961, we have been manufacturing standard and custom flexible products made of technical fabrics coated with elastomers and/or plastomers.

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Trench Safety


BACKFILLING can be a challenge when trying to keep enough backfill behind the box and still support it without creating a pivot point (rather than stabilizing the trench box).

  • To fill a void between the trench wall and a metal trench box, simply slide the SMARTFILL bladder into the void and inflate.
  • Allows for virtually 100% contact between the trench and the box.
  • Easily conforms itself to uneven trench walls.
  • Once the job is complete, simply deflate the SMARTFILL bladder and remove the box.
  • Allows the operators to save valuable time and makes their job safer and faster.


SMARTSHORE®, inflatable trench shield developed by PRONAL, is certified in all 50 States Registered Professional Engineer in accordance with OSHA standard 29 CFR, part 1926, subpart P. 

SMARTSHORE® advantages

  • TOUGH: made of special double wall, rubber coated fabric, hot vulcanized, the SMARTSHORE® shields are highly resistant to wear, abrasion and punctures.
  • FLEXIBLE: depending on the trench conditions, the SMARTSHORE® shields can be placed in vertical or horizontal position and can easily adapt to uneven surfaces. There are four different lengths of struts available.
  • SAFE: protects against cave-ins or trench collapses allowing personnel to safely exit the trench in case of an emergency
  • EASY & QUICK TO INSTALL: thanks to its light weight, SMARTSHORE® system only requires about 10 minutes to set up. In most cases, only a suitable compressor is required for the installation.
  • EASY TO TRANSPORT: foldable and light weight, this system is convenient to transport.