Twinwall Drainage Rubber Seals

Premium quality twinwall seals compatible with our collection of twinwall drainage pipes and twinwall fittings. Browse our range below and make sure to order before 5pm today for guaranteed delivery tomorrow. 

Any questions, just call our friendly team on 01420 555600. For larger projects, take a look at our free material take off service

Our Range of Surface Water Twinwall Seals

Our twinwall seals are available in a wide range of sizes, from 150mm to 900mm, and all made using high-grade rubber for enhanced performance. Drainfast seals are compatible with a range of twinwall products for surface water drainage applications. 

All our twinwall seals are sourced from reputable manufacturers and available with nationwide delivery. Our seals are part of our wide range of drainage products, including underground flexible fittings and underground drainage pipes

Why choose Drainfast as your twinwall supplier? 

For quality products, competitive prices and outstanding service, choose Drainfast. We offer a wide range of twinwall seal sizes, compatible with a selection of twinwall surface water drainage products

  • High-quality seals 
  • Exceptional customer service 
  • Free take off service
  • Guaranteed next day delivery when you order before 5pm 
  • Nationwide support and shipping 

Frequently Asked Questions

What are Twinwall seals?

Twinwall seals are made from rubber and are designed to create watertight connections between sections of twinwall surface water drainage networks. They remove the need for adhesive and are installed between pipe ribs for a tight seal.

What are Twinwall seals made from?

The typical material of choice is Ethylene Propylene Diene Monomer (EPDM). EPDM is a form of synthetic rubber that’s extremely flexible and durable, perfect for underground drainage applications where maintenance or replacement may be difficult. 

What is the correct way to install Twinwall seals?

Installing Twinwall seals is simple: 

  1. Prep and clean the pipe - make sure the male end of the pipe and the coupler are clean and dry and cut away any damaged sections 
  2. Position the seal - lubricate the seal and place it into either the third or second valley of the pipe, depending on the pipe size 
  3. Connect the pipe - insert the coupler into the pipe, being careful not to move the seal 

What are the common causes of seal failure?

There are four common reasons that twinwall seals might fail: 

  1. Improper installation - if the seal is not seated properly, poorly lubricated or contaminated during installation, it is more likely to fail over time 
  2. Environmental disturbance - ground movements around the pipe or root intrusion can cause the seal to fail 
  3. Material aging - sometimes, failure is caused by nothing more than the seal aging and cracking or becoming brittle 
  4. Mechanical stress - if the pipe or seal are not properly protected from ground movements or surrounded with the correct granular materials, the seal can become damaged

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