Injection hose systems

When sealing construction joints in concrete construction, groutable injection hose systems are used as an alternative or supplementary to classic waterstops or metal waterstops. Hose systems show their advantages not only in heavily reinforced structural elements or in complicated geometries: They can also serve as a supplement to conventional joint sealing systems as an additional “insurance policy”, so to speak, for leaks in the joint that occur years later, which can otherwise only be sealed with much greater effort.

Functional principle
The use of injection hoses is intended to seal and close any working or predetermined crack joints that may have occurred, especially after the production of concrete structures; detachments between installation parts and concrete can also be sealed in this way.

Put simply, in an injection hose system, a hose perforated with numerous holes is applied to the area of the later joint with the help of clamps; the ends of the hose are closed and stored in such a way that they are still accessible after the second concrete has been poured.

After the concrete has hardened, special crack filler is injected into the hose, which escapes from the perforation of the hose due to the injection pressure, distributes itself in any hollow spaces around the hose and reacts there to form a permanently sealing mass: The joint is sealed.

Depending on the injection material used, the hose can then be treated with a special cleaner and rinsed free so that it can be injected again at a later time – even years later – if necessary.

VPRESS® and ECOPRESS injection hoses, which can be injected several times, have been used successfully for construction joint sealing for many years. They can be injected with microfine cement, polyurethane resin or acrylate gel.

In contrast to passive sealing systems such as conventional water stops and waterstop sheets, which only seal off due to the so-called circumference extension, active systems such as injection hoses and injection grouts can be used to cancel out possible weak points in the concrete caused by cracks or badly compacted concrete.

  • Sealing and restoration in one step
  • Single injection with Polyurethane resin
  • Multiple injection with microfine cement or acrylate gel
  • Specially suitable for difficult construction joint run

Recommended systems


Injection hose consisting of a slightly-foamed PVC with ribbed surface

Also with 10 mm inner-Ø for special requirements and overlength up to 30 m
Good locking into concrete


Injection hose consisting of a slightly-foamed PVC with ribbed surface

  • Good locking into concrete
  • Overlenght approved up to 20 m

Recommended grout


Rubber-elastic, 3 C acrylate gel, multi purpose applicable

  • Very low viscous acrylate gel with high flexibility
  • Very good penetration, even in water filled cracks
  • Long term stable. Proven stability of at least 16 years


2-component injection resin based on polyurethane

  • Officially approved system
  • Proven against water pressure of 7 bars
  • Approved for use in CHF and LMSS plants


2-component high flexible injection resin based on polyurethane

  • Universal and economical
  • highly flexible < -50°C


Single-component injection material based on extra-fine cement

  • For injection in cracks above 0.2 mm


Packer for injection hoses

For screw-in the bleeding air hose

Stopper Inner thread M 8

7mm free passage, for cement injection.

Fast click stopper R1/2″

ball valve R1/2″,

hose for bleeding air from injection hoses

screw-in connection

Protective box


for closing airbleed hoses

  • for hose inner ø 6 mm
  • for hose inner ø 10 mm

Shutter connectors and cover caps

Extension pipe

M 8, Length 35mm, for shutter connectors for cement injection

Plastic clips

for fixing

Metal clips

for fixing

Punsh dowel for metal clamp

with hole diameter of 6,1 mm

Fixing clamp

for fixing injection hoses on metal water stops.


to fix injectionhoses like MEDIPRESS, VPRESS and ECOPRESS to PVC water stops



The hoses are fitted in the center of the reinforcement using hose sections of between 8 and 10 m in length. Longer lengths of hose can be achieved, if required due to construction conditions, depending on the grout used.
MEDIPRESS, VPRESS® or ECOPRESS injection hoses and air bleed hoses are joined simply and without tools using screw-in grommets which are screwed into the hoses by hand.
Fixing of the injection hoses is carried out using plastic clips (which can be dowelled or pressed into fresh concrete) or with nail clips. As a rule the venting ends are guided from the construction at right angles. For multiple injection of the injection hoses it is recommendeded either to fit the venting ends with nail packers or to keep them together in storage boxes.

Storage box and nail packers

Nail packers are directly plugged into the venting hose and onto the shell partition. The coloured foam sponges must match the colour of the hose so that the corresponding section of the hose can be identified after the casting of the concrete.

Injection hoses for sealing of biogas plants

Flexible sealing system, approved for use in CHF and LMSS plants