Our unique Calibration Hose provides a fast, high quality solution for pipe rehabilitation. With an advanced silicone formulation, our calibration hoses are tough and re-usable – for long-run cost effectiveness.

Manufactured from a unique combination of silicone rubber and polyester fabrics, and available in single or two ply, precision-engineered to offer significant advantages over PVC-based alternatives. Benefits include including excellent expansion and flex properties, added durability, high temperature resistance, and maximum re-usability.


Expansion and flexibility

Manufactured with a smaller O/D than the pipe itself, and a wall thickness of just 1mm-2mm, our hoses are designed to allow maximum flexibility and expansion. This enables the ideal pressure against the liner during the curing process, for reduced ‘wrinkling’, smoother flow through the finished pipe, and longer-lasting repair work.

Added durability

With robust, hardwearing construction and excellent UV, ozone, chemical and tear-resistance, our Calibration Hoses offer maximum durability whilst retaining the flexibility required for trouble-free inversion and navigation around bends.

Temperature resistance

Excellent resistance to high temperature makes silicone the ideal solution for rapid steam curing, with no risk of melting. Together with excellent heat transfer rates, it means a faster and more economical curing process. 


Non-stick construction enables easier to release and remove from the pipe, minimising the risk of damage or residue, and enabling multiple re-use – for lower lifetime cost.

Typical Material and Physical Properties

  • The hoses / bladders are a combination of specially selected knitted polyester fabrics and silicone rubber
  • Typically the hoses / bladders are sized 10% below the inside diameter of the damaged pipe
  • Standard length range of 30m to 200m (100ft to 650ft)
  • Standard diameter range of 60/75mm to 915mm (2.4/3” to 36”)
  • 2 ply reinforced standard thickness of 2mm (0.08”)

Value adding features:

✔ Highly durable over a wide temperature range  (-40ºC to 200ºC / -40ºF to 392ºF) [steam / re-rounding]

✔ Section thickness of only 2mm (0.08”) facilitats good heat transfer, fast cure time and flexibility (capable of being easily inverted), while still being robust enough to push out any liner wrinkles

✔ Excellent release properties allows easy withdrawal and multiple use

✔ Good chemical resistance

✔ Excellent UV and ozone resistance

How The CIPP Process Works

The non-invasive, cured-in-place pipe rehabilitation process begins with the resin-impregnated liner and silicone calibration hose (sometimes called inflation bladder or tube) being inverted or pulled into the damaged pipe.  The curing agent, often hot water or steam, is then circulated through the hose, causing it to expand and hold the liner up against the inside of the host pipe while the resin is cured.  Once the cure process is complete, and the liner has set to form a tight fitting pipe within a pipe, the silicone calibration hose is deflated and withdrawn from the renovated pipe ready to be used again.

Fenner Precision’s range includes flexible hoses in various thicknesses, silicones and reinforcements, each of which can be selected to best suit the Client’s individual application needs.  Materials have been uniquely developed to facilitate expansion of the hose, this helps to expel wrinkles in the liner and optimize water flow within the new pipe.  The high wear resistance and release characteristics of silicone mean that the hoses can be easily removed for reuse, while silicone’s high temperature properties make the hoses the ideal choice for steam curing processes.

These hoses are also suitable for renewing and repairing the following types of worn or damaged pipes:

  • Internal Pipes
  • Potable Water Pipes
  • Chimney Flues
  • Oil and Gas Pipes
  • And more

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