Sealing cushion materials:
The flat tube cushion is made of a five-layered aluminium laminate. The high quality of both material and processing guarantees a very low diffusion/leak rate of ~ 0.73 mbarl / year and ensures a long service life.

The filling unit:
In order to be able to fill the sealing cushion several times (4 times), a patented metal air valve with a plastic-coated valve extension is connected to the sealing cushion by means of a heat-seal welding process. The pressure is filled via a pressure hose, which is plugged onto the sealing cushion to fill the car valve. After the pressure has been filled, the valve is sealed pressure-tight with the valve cap.

Tight against gas diffusion, dust, water (5 m water column) and chemical mixtures

The high-quality, robust aluminium laminate …

• adapts flexibly to the sealing area, independently of cable diameter
  and configuration or contamination by dirt
   
• ensures a long service life
   
• is resistant to chemical mixtures pH2 to pH12, fuels etc.

Coated with swelling material product group WO 22.2 QV-DBK ...

• ensures tightness up to 0.5 bar/ 5 m water column immediately on contact with water
   
• ensures tightness against gas diffusion (volatile halogenated hydrocarbons in soil air < 100 mbar)
   
• allows quick, easy removal (< 2 min). No adhesion! Makes damage-free removal possible:

The patented car tyre valve construction …

• Is simply inflated with compressed air (CO2-free!)
   
• makes on-site overpressure inflation technology simple
   
• allows flexible adaptation of the inflated cushion to fit the
  surrounding space and prevents buckling of cables and ducts
  or changes in technical transmission properties
   
• facilitates quick removal of air after cable retrofitting, by using
  accessory vacuum pump 33 VMSP or by changing the valve insert
   
• facilitates damage-free removal and re-installation