Forsheda 118 Sealing System for Sewer and Stormwater Manholes

System Description

Forsheda 118 is a pre-lubricated sliding seal that is stretched onto the spigot of the manhole. Additional lubricant is not required for joint assembly. The joint design is standard in many countries. The seal is designed with a sliding mantle which is internally lubricated. The mantle is fully closed to ensure the lubricat stays in place. During installation the thin mantle slides over the body of the seal. This design permits installation with very low force, as there is no friction between rubber and concrete. The special design of the joint and seal make the system easy to centre during jointing.

Forsheda 118. Design and funtion. Trelleborg

Seal Performance

The Forsheda 118 seal meets all relevant current European standards.

Joint performance is dependent on dimensional accuracy and surface finish of socket and spigot.

Test reports are available from Trelleborg Pipe Seals on request.

Forsheda 118. Seal performance. Trelleborg


  • Synthetic SBR or EPDM rubber

  • Hardness 40±5 IRHD

  • Approved in accordance with EN 681-1

  • Protected against ozone

  • Oil resistant grades are available on request

Seal Dimensions

Examples of Sizes

A-mm B-mm Joint GAP
 18.0  25.0 10.4±1.4
 20.0  26.5 11.5±1.5
 21.5  30.0 12.5±1.6
 22.0  30.0 12.7±1.7
 24.0  33.0 13.5±2.0
 28.0  38.0 16.0±2.5
 Please contact Trelleborg Pipe Seals for technical advice and joint design recommendations to meet your performance requirements.
Forsheda 118. 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

Video Joint Assembly

Forsheda 118. Trelleborg

Step 1

Stretch the seal onto the spigot and position against the shoulder.

Forsheda 118. Trelleborg

Step 2

Equalize the stress in the seal by lifting and releasing at a few points. The seal must sit evenly against the spigot shoulder all around the manhole.

Forsheda 118. Trelleborg

Step 3

Lubrication of the socket or spigot is not required. Centre the joint and assemble. The position of the seal in the final mahole joint is shown.


More detailed information

Datasheet Forsheda 118


Download (pdf)


Technical Approvals, Patents, Quality Standards

CE Mark


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