Pronal - Customer Engineering

Pronal - Products - Inflatable Pipeline Stoppers

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Products -

Made from high quality fibre-reinforced elastomer, Pronal inflatable pipe stoppers are used to:

  • Test pipes for leaks under pressure (joint testing)
  • Isolate pipes for maintenance (inspection stoppers)
  • Temporarily seal pipes to avoid runoff of toxic materials (pollution stoppers)
  • Provide highly portable and re-usable medium and high-pressure stoppers for offshore use
  • Provide high-pressure, self-contained stoppers for specialised uses, from power stations to nuclear plants

Where water flow needs to be stopped, inflatable stoppers are an efficient solution. By creating an airtight seal within the pipe, they effectively stop the water flow to enable professionals in different industries to do their job and resolve the situation.

They can also be used in testing air and water pressure, locating leaks, and even allowing the injection of chemicals into a pipeline without a hazardous backup.

Stoppers - Illustration


  • Suitable for a wide variety of pipes: concrete, cast iron, steel, stainless steel, PVC
  • Simplicity and speed of installation
  • Completely leakproof
  • Safe to use
  • Sturdy with long service life

Highly diversified range

  • No size limits, up to 3,000mm in diameter
  • Either standard or made-to-measure
  • Models for low pressure and high pressure (over 100 bar)
  • Choice of shapes (cylindrical, ovoid, square)
  • Specific models to comply with particular specifications including:
    • Vari plugs 45-1500mm with blank stopper, bypass for watertightness tests; and rod for mini pipes
    • Uni-Plug collapsible pipe stoppers from 20-3000mm that compactly fit around obstacles, corners and into previously inaccessible areas of surface, underground and underwater pipelines.
    • Pollu-Plug anti pollution stoppers permanently fitted in stormwater and sewerage lines ready for rapid inflation by remote triggering as soon as an emergency arises in industrial, civil and municipal applications.

Anti-Pollution Stopper - Illustration

Pronal leak sealing systems

In addition to stoppers used within pipelines, Pronal leak sealing systems can be applied externally to pipes and tanks to provide immediate assistance in the event of accidents or emergencies. Their robust construction allows them to be used in heavy duty applications which require compatibility with hydrocarbons.

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The systems' inflatable belts and pads are wrapped around the leaking pipe, or secured over other leaking surfaces, then inflated at up to 5 bar (depending on application) to press their sealing surface against the leak.

The system is quickly and easily inflated by the type of onboard compressor found in a wide variety of service vehicles, or by using a compressed air cylinder.

While designed to be extremely light weight for rapid surface, air or sea deployment (the smallest, 420X520mm unit weighs under 8 kg complete with straps) the robust system can seal external leaks affecting fire brigades, refineries and petrochemical plants. It can also be used with remote site maintenance or service vehicles used by a wide variety of industries. Held in place by belts with a breaking strain of up to five tons, the Pronair units' robust construction allows them to be used in heavy duty applications.

Do you require a specific product?

We can often provide made-to-measure solutions. Please contact us to discuss your specific requirements or send us a description of your particular needs.

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