Rubber Expansion Bellows

Rubber bellows expansion joints come in a very wide range of sizes, materials and styles. FlexEJ is here to help you select the rubber expansion joint or rubber bellows best suited to your application. FlexEJ’s extensive UK stock of HVAC and Elaflex rubber bellows allows many requirements for rubber expansion joints to be met immediately. Safetech manufactured to order rubber bellows expansion joints complete our unrivalled range.



What is a rubber expansion bellow?

Things to consider....

  • Materials
    12 different rubber compounds for the bellows
  • Application
    Water, oils, chemicals, foods, gases - we have a solution
  • Rating
    -40°C up to +150°C, typically PN6 to PN16
  • Web Shop
    Many available online with next day delivery from our web shop.

Selecting Rubber Expansion Joints

1 Styles2 Applications3 Availability4 Do I need tie rods?5 Replacing old bellows6 Let us help
Rubber bellows types

Rubber expansion joints come in three main styles:

  • Swivel Flange, single arch, rubber bellows which are moulded and available in specific lengths
  • Full Face rubber expansion joints which are made to order with 1-4 arches
  • Twin Sphere rubber joints which are moulded with 2 arches and supplied with BSP ends
Rubber bellows media compatibilityTemperature, pressure and rubber/fluid compatibility are key factors in selecting the best rubber expansion joint. Our Bellows Finder can help you with finding the right rubber bellows or alternatively get in contact and we will be pleased to help.
Rubber bellows direct from FlexEJFlexEJ stock a wide range of rubber bellows for HVAC and Industrial applications. The most popular of these with PN16 flanges or BSP ends are in our Web Shop shipping the same day for next working day delivery.
Rubber bellows tie rods It depends on your piping movements and system. Any flexible rubber joint will exert a pressure force on the pipe (see FAQ) which must be restrained with tie rods or absorbed at the piping anchors. If the anchors and pipe guides are adequate, no tie rods are needed and the rubber expansion joint will allow axial movement. Tied rubber bellows will allow lateral and angular movements with the pressure force fully restrained.
How to replace an old rubber bellow If you have the basic details, we can normally offer a direct replacement for an existing rubber expansion joint. If you are uncertain about what you already have installed our Flange Finder will help you identify it.
FlexEJ's rubber bellows sSupport team Call our expert team on +44 (0) 1384 881188 or email us at or use Live Chat on this web site - we are here to help, please get in touch.

Can't see what you want? Need help?

Call us. Or use Live Chat.

For instant advice. We can custom-design and engineer almost any expansion joint you need for delivery in the UK or worldwide. Call our expert team on +44 (0) 1384 881188. Or email us

FlexEJ's Rubber Bellows

We have three distinct ranges of rubber bellows:

HVAC Rubber Bellows
DN20 to DN250

HVAC Rubber Bellows

Available in a wide range of sizes, flange and restraint options

Designed for lower temperature applications in the HVAC market, these expansion joints offer good value, quick delivery from stock and are available as both flanged and union ended.

Elaflex Rubber Bellows
DN25 to DN1000

Elaflex Rubber Bellows

Renowned for their high quality and durability

Elaflex rubber expansion joints have over 8000 standard configuration options which includes a range of high quality rubber formulations to suit a vast range of applications. Core range in stock at FlexEJ.

Safetech Manufactured Bellows
DN600 to DN3000

Manufactured Rubber Bellows

Fully engineered large diameter rubber expansion bellows

FlexEJ's sister company, Safetech, designs and manufactures rubber expansion joints in Spain. We can offer multiple arch, reducing and rectangular bellows in all diameters and to over DN3600

Need a detailed quote?

Get A Quote. On us.

We will provide full technical details together with, pricing and shipping timescales. For more complex engineered quotes, preliminary sketches and calculations will be available.


Who can you talk to?

Try our sales and customer service team on 01384 881188

They don't bite. And they know what they're talking about. Call the team any time from 8:30am to 3:30pm weekdays, 12:30pm Fridays or use LIVE CHAT if you would prefer a quick text answer. For more complex queries, send us any pro-forma documentation using the get a quote form below or email us

Call Us

Not sure what flange spec you need?

Use the FlexEJ Flange Finder to find out

FlexEJ stock a full range of specs and types for our bellows. Or call our expert team on +44 (0) 1384 881188.

Frequently Asked Questions

Q. Do you hold stock of rubber bellows?
A. Yes. FlexEJ holds a large stock of the most popular sizes and types of Elaflex rubber bellows as well as our HVAC value bellows range. We also hold stock of the most popular metal bellows for HVAC. Many of these items are available on 24hr delivery from our online web shop. We can also manufacture to order. For sales assistance please contact us or use our Live Chat facility.
Q. How do you identify flanges?
A. Our Flange Finder contains details for many common flanges. Typically, to be able to make the identification you need to know the bore size or outside diameter and number of bolts. For technical assistance contact us or use our Live Chat facility.
Q. How do you install a rubber bellows or a metal bellows?
A. Please refer to our guidelines for installation, anchoring & guides. They are available in the Downloads section of this website: Elaflex Rubber Bellows Installation Instructions and FlexEJ Metal Bellows Installation Instructions. For technical assistance please contact us or use our Live Chat facility.
Q. What lengths of rubber bellows do you offer?
A. FlexEJ Value HVAC and Elaflex rubber bellows are stocked in a number of standard lengths from 105mm to 300mm, a summary of lengths, diameters and types can be found on each product page. We also offer fully engineered rubber bellows which are available in custom lengths to suit the application. You can use our bellows finder to find the most suitable product. For technical assistance please contact us or use our Live Chat facility.
Q. Can you match another brand / manufacturer of expansion joint or bellows?
A. Yes, if you have the details we can normally offer an equivalent, our FAQ here gives the information we will need for a full selection. For technical assistance please contact us or use the Live Chat link on this page.
Q. What do I need to know to identify an existing expansion joint or bellows?
A. To identify an existing expansion joint we need to know: nominal bore, overall length and flange type plus service, temperature, pressure and required movement if known. Try our Flange Finder to help identify the flange and you can send us a picture of the existing part using the Contact us form. For technical assistance please contact us or use the LIVE CHAT link on this page.
Q. Do you have rubber bellows for drinking / potable water or with WRAS approval?
A. Yes, our Elaflex ERV-R and ERP rubber bellows have WRAS, DVGW and ACS approval for drinking water. The Safetech manufactured to order rubber bellows can be supplied with WRAS approved EPDM linings. Our MRCA copper ended metal expansion joints also have WRAS approval. For technical assistance please contact us or use the LIVE CHAT link on this page.

Please visit our full FAQ page to see all our frequently asked questions.

Can't quite find the right bellow?

Try the FlexEJ Bellows Finder

Or call our expert team on +44 (0) 1384 881188

Got a quick question?

Use Live Chat. Or call us.

For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188

Get A Quote

Please complete the short form here and we'll get back to you within 24hrs Monday to Friday (quicker if marked urgent).

Alternatively, you can also call our expert team directly on +44 (0) 1384 881 118 from 8:30AM to 4:30PM weekdays (12:30PM Fridays), who will be only too pleased to talk through your requirements and technical queries over the phone.

Visitors are also welcome Monday to Friday although please get in touch beforehand to let us know you're coming.

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    Industry experience

    FLEXEJ Ltd was formed in 2002 by two professional engineers who brought together an already highly respected design capability with business and commercial skills gained in large multinational companies.
    • Our focus has always been on application and design – helping our customers find the best value solution.
    • We have a strong engineering and manufacturing team with experience in petrochemicals, refining, nuclear, desalination though to HVAC.
    • The team is also very familiar with meeting complex requirements for documentation, in process NDT and test on projects. We have supplied many large end-users such as EDF, Exxon, Shell, Reliance & QatarGas working with major contractors such as JGC, Foster Wheeler & Technip.
    FlexEJ Industry Experience