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Tyton-Sit VIPER® Gaskets


Check your restrained gasket has been tested in accordance with EN545:2010 as well as EN545:2006 – Our Tyton-Sit VIPER® does!

Our Tyton-Sit Viper® restrained gasket solution is specifically designed to meet the requirements of BS EN 545:2010 Ductile iron pipes, fittings, accessories and their joints for water pipelines.

One of the key differences between EN545:2006 and EN545:2010 was the reduction in pipe wall thicknesses. This presented a significant challenge for existing self-restraining gaskets which were designed to work using the older, thicker-walled pipe from the EN545:2006 standard.

The difference in pipe wall thicknesses following the introduction of EN545:2010:

COMPARISON TABLE - Pipe wall thickness

COMPARISON TABLE – Pipe wall thickness

What is Tyton-Sit VIPER®?

VIP is recognised as the leading global manufacturer of self-restrained gaskets for ductile iron pipe and as a result, our Tyton-SIT VIPER® gaskets are selected as original equipment by many of the leading global producers.

Each design has been thoroughly tested in accordance with EN545:2010/ EN598:2007 and our Tyton-SIT VIPER® gaskets fully comply with the requirements of BS6920 as well as holding numerous International potable water approvals including WRAS material approval at temperatures of up to 60º.

  • Designed to suit Tyton® socket according to DIN28603
  • Self-restrained gasket used to joint ductile iron pipes to EN545:2010 (also EN545:2006) & EN598:2007
  • Supersedes the Tyton-SIT gasket by all major pipe manufacturers globally since the 1970s

A manufacturer you can trust. We have manufactured over seven million self-restraining gaskets for Tyton ductile iron pipes since the 1970s.

What are Tyton-Sit VIPER® gaskets?

These are self-anchored joints designed for underground applications which eliminate the need for thrust blocks at changes in direction, making them particularly suitable for difficult or unsuitable ground conditions such as soft ground or subsidence-prone areas; where space is limited such as steep inclines, urban areas or under rivers.

Benefits of Tyton-Sit VIPER® vs Concrete Thrust Blocks

thrust_b - Tyton-Sit Viper®

  • Concrete thrust blocks are often impractical due to unstable ground (i.e. groundwater)
  • Contractors/ Engineers use far more concrete than the design stipulates “just in case”
  • Difficulty pouring in freezing conditions
  • Environmentally unfriendly; the cement industry is responsible for 5% of worldwide man made carbon dioxide (CO2)
  • Expensive to dispose of soil matter removed from trench
  • Impractical and can cause disruption in city centre excavations
  • In congested trenches, not always possible to pour thrust blocks without interfering with other utilities

Benefits of Tyton-Sit VIPER® vs External Mechanical Restraint System

  • External mechanical restraint systems cost considerably more
  • More difficult to install as access needed to reach bolts beneath the joint
  • Entire assembly needs to be protected from corrosion
  • Larger trench needed compared with Tyton-SIT VIPER®
  • Installation time of Tyton-SIT VIPER® typically 35% of the time taken to install External Mechanical Restraint
  • Quicker installation
  • Better for the environment
  • Less disruption
  • Lower installation costs
  • No large excavation required

Operating Pressure Tyton-Sit Viper®

Full pressure data according to all EN545:2010 pipe classifications can be found here

Compatibility of Tyton-SIT VIPER®

Our Tyton-SIT VIPER® gaskets are compatible with ductile iron pipes from most Global manufacturers – if in doubt, please check with us first –


  • BS6920. Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water.
  • ISO 3302-1:2014. Specifies classes of dimensional tolerances and their values for moulded, extruded and calendared solid rubber products.
  • BS EN 681-1. Elastomeric seals. Material requirements for pipe joint seals in water and drainage applications.
  • ISO 2230:2002. Rubber products. Guidelines for storage.
  • BS EN 598:2007+A1:2009. Ductile iron pipes, fittings, accessories and their joints for sewerage applications. Requirements and test methods.
  • BS EN 545:2010. Ductile iron pipes, fittings, accessories and their joints for water pipelines. Requirements and test methods.
  • DIN 28603 Ductile iron pipes and fittings – Push-in joints – Survey, sockets and gaskets


To learn more or to enquire about the Tyton-SIT VIPER® range contact the sales team

Benefits of Tyton-SIT VIPER®

  • Moulded Seals are available for pipes up to 2200mm Diameter
  • Designed to fit DIN28603 sockets and suitable for pipe manufactured in accordance with DN545 & EN598
  • Material fully WRAS approved and BS6920 compliant – up to 60º
  • Approved for use in Germany, France, Middle East, as well as a number of other countries globally.