DOYMA Curaflex® pipe sleeves

The Curaflex® pipe sleeve range from DOYMA are proven for cases in which sealed apertures for construction are needed. Together with the DOYMA pipe gasket inserts they form a perfect pipe sealing solution. They are made from special fibre cement or steel. Curaflex® cable sleeves allow access for all piping during the building phase or after construction. DOYMA’s Curaflex® pipe sleeves offer all this even where there are no suitable core bores or openings available.

Sealing against pressing water

Product Membranes/ bituminous
Without tanking With tanking In the wall On the wall face
Curaflex® 3000 Curaflex® 3000
Curaflex® 3000/T Curaflex® 3000/T
Curaflex® 9000 Curaflex® 9000
Curaflex® 8000 Curaflex® 8000
Curaflex® 8000/T Curaflex® 8000/T
Curaflex® 4006 Curaflex® 4006
Curaflex® 6000 Curaflex® 6000
Curaflex® 7006 Curaflex® 7006
Curaflex® 7006/T Curaflex® 7006/T
Curaflex® 7006/M/S Curaflex® 7006/M/S

Sealing against non-pressing water

Product Membranes/ bituminous
Without tanking With tanking In the wall On the wall face
Curaflex® 3000 Curaflex® 3000
Curaflex® 3000/T Curaflex® 3000/T
Curaflex® 9000
Curaflex® 8000 Curaflex® 8000 ✔ with bituminous thick coating
Curaflex® 8000/T Curaflex® 8000/T ✔ with bituminous thick coating
Curaflex® 4005 Curaflex® 4005
Curaflex® 5000 Curaflex® 5000
Curaflex® 7005 Curaflex® 7005
Curaflex® 7005 Curaflex® 7005/T
Curaflex® 3001 Curaflex® 3001

Pressing / non-pressing water

Pressing water – water which exerts hydrostatic pressure (even if limited in time, e.g. accumulating seepage water) on the structural element with the feedthrough. Groundwater and floodwater are typical water types. Non-pressing water – water which does not exert any hydrostatic pressure on the structure. Capillary water is a typical water type.

Without tanking membranes / bituminous coating (white tank),
with tanking membranes / bituminous coating (black tank)

Non-waterproof structures must be protected with a sealing coat against penetrating water. This sealing coat can be in the form of sheeting, trowelable or liquid-applicable masses and therefore results in a skin-type seal. Since bitumen plays a major role in terms of materials, these forms of seals are often known as a “black tank”. Waterproof or non-water-permeable structures do not require additional skin sealing. This type of structure includes those using impermeable reinforced concrete. This type of structural waterproofing is also known as a “white tank”.

Installation in the wall / in front of the wall

The wall thickness is normally sufficient for installing a Curaflex® cable sleeve. In this case, the sealing system is also located in the wall. If the wall is too thin, or the costs too high, to adapt the wall feedthrough for inserting a pipe sleeve and a gasket insert appropriately, it is recommended that the system is installing on the face of the wall.

Curaflex® pipe sleeve 3000
Curaflex® pipe sleeve 4006
Curaflex® pipe sleeve 6000
Curaflex® pipe sleeve 8000/T

The Curaflex® pipe sleeve

Technical information

Application areas

Practical experience on site has shown that only by installing Doyma sealing systems, consisting of cable sleeve and gasket inserts, secure and lasting watertight penetrations for pipes and cables through walls, ceilings and floors are guaranteed. A Curaflex® cable sleeve, whether manufactured from special fibre cement or from steel, and Curaflex® gasket inserts form a reliable sealing system of highest quality for all pipe and cable service ducts leading from outside into a building.


The sleeves are manufactured, in accordance with the numerous constructional requirements, from special fibrous cement and/or steel for the commonly encountered conditions of pressing and non-pressing water and ground moisture.

Curaflex® special fibre cement pipe sleeve

  • Manufactured from special high-grade, asbestos-free fibre cement.
  • Principal installation area of the sleeves: in structural walls, floors and ceilings.
  • The material absorbs moisture from the surrounding structure, the formation of shrinkage cracks is eliminated.
  • Series Curaflex® 3000 has a grooved outer surface in order to become absolutely homogenous with the structure, providing a durable, watertight bond with the concrete because he coefficient of expansion of the material corresponds to that of concrete.
  • The inside face of the sleeve provides an optimum contact surface for the elastomer of the gasket insert when installed in the sleeve.
  • No corrosion is possible.

Curaflex® steel sleeves

Steel sleeves are equally reliable and durably resistant construction components for use with Curaflex® gasket inserts.

Steel grades (materials) and surface treatment Materials

  • Mild steel S235JRG2 (1.0038)
  • Stainless steel grade 304 (≈ 1.4301 = V2A)
  • Stainless steel grade 316 (≈ 1.4571 = V4A)

Surface treatment

  • Electro-galvanized mild steel (DIN 50961), yellow passivated and sealant coated. Passivating approximately doubles the corrosion resistance of electro-galvanized steel; Coating doubles the resistance yet again – a four-fold improvement over simple electro-galvanized steel.
  • Stainless steel grades 304 and 316 are supplied in pickled condition.

Product line

Special fibre cement pipe sleeves

Curaflex® 3000: Sleeve with grooved outer face.
Curaflex® 3001: Sleeve with additional flange suitable for structures with bituminous thick-coating.

Special fibre cement pipe sleeves with fixed and loose flange made of cast iron:

Curaflex® 400x: Sleeve combines the advantages of the special fibre cement sleeve with the durability of cast iron.
Curaflex® 4006: Sleeve with bonded cast iron fixed flange for sealings on buildings with tanking membranes, leak-proof against pressing water.
Curaflex® 4005: Same as Curaflex® 4006, but against non-pressing water.

Curaflex® steel cable sleeve

Curaflex® 6000: Steel sleeve with continuously welded fixed flange. Used together with a loose flange and a gasket for sealing penetrations through buildings with tanking membranes against pressing water.
Curaflex® 5000: same as Curaflex®6000, but against non-pressing water.
Curaflex® 7006: Sealing of pipes/cables on the face of walls -with a fixed and loose flange construction for buildings with tanking membranes or bituminous thick-coating. Sealing against pressing water. Curaflex 7006/T in split form for retrofit installation.
Curaflex® 7005: same as Curaflex®7006, but against non-pressing water/soil moisture.
Curaflex® 8000: sealing of pipes/cables on the face of walls with fixed flange.
Sealing against pressing or non-pressing water. Curaflex 8000/T in split form for retrofit installation.
Curaflex® 9000: Steel sleeve with continuously welded puddle flange. Sealing against pressing water, non-pressing water/soil moisture.

Installation of a Curaflex® pipe sleeve

Installation example of Curaflex® 8000 in connection with butyl sealing tape (1753)

Curaflex® C/2/SD/6 gasket insert installed in core bore.Curaflex® C/2/SD/6 gasket insert installed in core bore.

Please note:

  1. The wall must be clean, flat and dry in the steel pipe sleeve installation vicinity.
  2. No grooves, cracks or breakouts may be present on the wall surface in the steel pipe sleeve installation vicinity.
  3. The steel pipe sleeve must be clean and free of dust and grease.
  4. If a pipe sleeve is present in the wall, it must finish flush with the wall surface.
  5. The diameter of the core drilling/wall pipe sleeve must be smaller than the steel pipe sleeve pipe socket. If this is not the case, a special construction is necessary.
  6. If the pipe/cable is not centralised in the pipe sleeve, a special construction may be necessary in consultation with DOYMA.
  7. You will require a sealing element to seal off the annular gap between pipe/cable and pipe sleeve. We recommend the installation of a Curaflex® gasket insert*
  8. To ensure that the Curaflex® Butyl sealing tape (1753) bonds better to the steel pipe sleeve, additional accessories are required, for example. Sika Adhesive Cleaner-1 (yield per litre: approx. 8 – 9 m2)*


DOYMA products are continuously being further developed, technical changes will take place without previous notification.

Extensive installation instructions are provided with the product.

*) not included in delivery

Curaflex® 8000 is a steel cable sleeve for sealing structures with bituminous coating (black tank) sealed against non-pressing water / soil moisture (not in acc. w. DIN 18195-9). The sealing material is a butyl sealing tape (1753). Installation of the pipe sleeve takes place on the existing, hardened thick-coated membrane.


Position the steel pipe sleeve in the wall and mark the rawlplug holes. Important: if pipe has already been laid, it is imperative that the pipe sleeve is centred in the pipe.


Drill the rawlplug holes and insert the rawlplugs.


Pre-treating the steel pipe sleeve with Sika Adhesive Cleaner-1. Apply to the rear side of the steel sheet (opposite the sleeve) with the help of a brush or cloth.


Glue the butyl sealing tape (1753) onto the rear of the steel sheet in a spider’s web pattern. Leave a diameter of around 25 mm free around drill holes. In this case, the rawlplug seam acts as a spacer between the wall and the sheet. A pre-requirement for permanent sealing is application of the sealing tape without gaps.


Push the plastic washers onto the special screws, and then fix the steel cable sleeve to the wall by placing and tightening the screws.


The installation is correct if butyl runs out around the entire circumference both inside and outside when tightening the screws. Remove any protruding butyl from the cable sleeve.