Bellows in stock, on line
From stock, next day delivery. Also from our web shop.

HVAC Rubber Bellows
Designed for water applications in building services. FlexEJ offers two ranges for this market : our value HVAC range which is suited to lower temperatures and pressures and the Elaflex range which features WRAS approval, high temperature durability and many more options:

HVAC Rubber Bellows
What is an HVAC Rubber Bellows?
Ideally suited to water applications and building services...
- Materials
EPDM with carbon steel flanges or cast iron unions. - Application
Water: drinking, LT and HT heating, waste, sanitary, chilled with tied or untied flanges or unions. - Rating
Wide range to suit all applications PN10, PN16 and temperatures to +130°C. - Approvals
WRAS (Elaflex ERV-R, ERP)
Elaflex Flanged rubber bellows see here
HVAC Union End rubber bellows
Size | Length | Pressure Rating | Movement | In Shop |
---|---|---|---|---|
DN020-¾" | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
DN025-1" | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
DN032-1¼" | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
DN040-1½" | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
DN050-2" | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
DN065-2½" | 240mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
DN080-3" | 240mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
HVAC Flanged rubber bellows
Size | Length | Pressure Rating | Movement | In Shop |
---|---|---|---|---|
DN032-1¼" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN032-1¼" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 35º | Yes |
DN032-1¼" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-12 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN040-1½" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN040-1½" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 35º | Yes |
DN040-1½" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-12 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN050-2" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN050-2" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 35º | Yes |
DN050-2" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-12 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN065-2½" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN065-2½" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 30º | Yes |
DN065-2½" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-12 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN080-3" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN080-3" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 30º | Yes |
DN080-3" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-12 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN100-4" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN100-4" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 25º | Yes |
DN100-4" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-16 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN125-5" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN125-5" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 25º | Yes |
DN125-5" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-16 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN150-6" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 7.5º | Yes |
DN150-6" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 15º | Yes |
DN150-6" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-16 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN200-8" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 5º | Yes |
DN200-8" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 15º | Yes |
DN200-8" | 150 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +9/-16 mm, Lateral +/- 12 mm, Angular +/- 15º | Yes |
DN250-10" | 106 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-20 mm, Lateral +/- 30 mm, Angular +/- 5º | Yes |
DN250-10" | 130 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +20/-30 mm, Lateral +/- 20 mm, Angular +/- 10º | Yes |
DN250-10" | 200 | 16 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +19/-19 mm, Lateral +/- 19 mm, Angular +/- 15º | Yes |
How to select an HVAC rubber bellows






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 sales@flexej.co.uk
FlexEJ's HVAC Rubber Bellows
FlexEJ has the following ranges of HVAC Rubber Bellows available:
HVAC FLANGED RUBBER BELLOWS
When a value HVAC bellow will meet your requirements
FlexEJ's Value Flanged rubber bellows are ideal for applications at lower temperatures and pressures and where WRAS drinking water approval is not required. Available in lengths of 106, 130 and 150mm (200mm at DN250) all flanged PN16, tied or untied, DN32 to DN250. All of these are available from our web shop on 24 hour delivery.
UNION END RUBBER BELLOWS
EPDM rubber with galvanised cast iron BSP union ends
FlexEJ's Value Union rubber bellows are ideal for smaller diameter applications at lower temperatures and pressures and where WRAS drinking water approval is not required. Length of 200mm (240mm at DN65) all with BSP Unions, DN20 to DN65. All of these are available from our web shop on 24 hour delivery.
ELAFLEX HVAC BELLOWS
RedSpot, RedBand and Rotex
The Elaflex range, manufactured in Germany, offers three types of rubber bellows designed for HVAC services. RedSpot is a highly flexible low pressure design with WRAS approval; RedBand is also WRAS approved and designed for higher pressures and temperatures; Rotex is a DIN4809 approved rubber bellows designed specifically for high temperature services. All Elaflex rubber bellows are available with a wide range of flange drillings, tied or untied. All three Elaflex ranges with PN16 flanges DN25 to DN150, tied and untied, are available with 24 hour shipping from our web shop.
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
HVAC rubber bellows comparison chart
Which HVAC rubber bellows is the best option for your application? Four potential alternatives to consider:
WRAS approved WRAS approved bellows
Is this bellow approved for use in all UK public mains water supplies?
Potable water Potable water
Is this bellow approved for water systems used for drinking and food preparation?
DIN 4809 compliant HT Heating Water DIN4809 compliant
Is this bellow compliant with the German DIN4809 standard of approval for warm water heating systems? (Max 100°C, 10 bar).
Rating barg/°C Pressure & temperature
What is the required pressure rating (in barg) compared to temperature rating for this bellow?
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.
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 sales@flexej.co.uk.
Can't quite find the right bellow?
Try the FlexEJ Bellows Finder
Or call our expert team on +44 (0) 1384 881188
Frequently Asked Questions
Please visit our full FAQ page to see all our frequently asked questions.
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.
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.

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.

