Trelleborg 165 Integrated Pipe and Manhole Seal, Sealing System for Sewer and Stormwater Concrete Pipes

System Description

Trelleborg 165 is a one-piece integrated seal for concrete pipe systems. It ensures a watertight seal between pipes, manhole sections and pipe connections to manholes. The seal is cast into the socket during pipe manufacture. This secures the seal in the correct position, minimizing the risk of seal displacement.

Forheda 165. Trelleborg

Seal design & function

Trelleborg 165 is co-extruded, using specially formulated EPDM rubber compounds of two hardnesses to form the perfect seal:

  1. The forming part, made of hard rubber (70 IRHD), ensures a secure and accurate joint profile during casting

  2. The sealing part, made of soft rubber (50 IRHD), is a combined lip and compression seal

  3. Holding sections are cast into the concrete during pipe manufacture, securing the seal in the correct position

  4. Slurry lips against the pallet prevent ingress during concrete compaction

Forheda 165. Seal performane. Trelleborg

Seal Performance

The seal meets or exceeds the requirements of all current relevant European standards including the FBS demands.



  • Synthetic rubber (EPDM)
  • Hardness 50+/-5 IRHD (Sealing part)
  • Hardness 70+/-5 IRHD (Forming part)

Size Chart

PIPE DN (mm)  PROFILE Effective thickness MM A (mm)  B (mm)


12.0 12.4 64.5
 300-600 14 14.0 14.7 72.4
 300-600 14T 14.0 14.6 86.5
 675-1200 18 18.0 18.4 89.2
 675-1200 18N 18.0 18.4 98.3
 675-1200 18T 18.0 18.4 109.2
 1200-1600 22 22.0 22.4 107.1
 1200-600 22T 22.0 22.6 119.4
 1600-2500 26 26.0 26.5 128.3
Forheda 165. Trelleborg

Dimensions and designation

All data in millimeter.

On each seal, profile thickness, outer diameter, recommended pipe measurement and production period are given. The corresponding data are also on the packaging.

Subject to change for technical reasons


Do you need support?

Please contact Trelleborg Pipe Seals for technical advice and joint design recommendations to meet your performance requirements. We will be happy to support you.

Joint Assembly

Forheda 165. Trelleborg

Check that the socket and spigot are in good condition and free from mud and gravel. Apply lubricant to the spigot. This should be spread evenly over the surface paying special attention to the front radius of the spigot.

Forheda 165. Trelleborg

Center the spigot into the socket and push the pipes together. The seal design prevents concrete to concrete contact.


Data Sheet

Trelleborg 165 Integrated Pipe & Manhole Seal  

Download (pdf)


Technical Approvals, Patents, Quality Standards

CE Mark


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