



Marshall Tufflex MER3WH White Circular Extension Ring For Round Conduit Boxes 25mm
MER3WH
Marshall Tufflex MER3WH Circular Extension Ring – 25mm, White PVC-U for Enhanced Conduit Box Depth
The Marshall Tufflex MER3WH Circular Extension Ring is designed to extend the depth of 25mm round conduit boxes. Made from super high impact PVC-U, it delivers exceptional strength and durability, ideal for professional cable management in all installation environments.
- 25mm Extension Fit: Designed to increase the depth of 25mm round conduit boxes, allowing for more internal space.
- Robust PVC-U Material: Made from super high impact PVC-U for long-lasting performance in demanding conditions.
- Reliable Compatibility: Forms a secure and stable fit with existing conduit boxes to maintain system integrity.
- Improved Installation Flexibility: Offers additional clearance for easier cable routing, terminations, or upgrades.
- Professional Quality: Trusted by electricians as part of Marshall Tufflex’s premium cable management range.
Technical Specification
- Type: Circular Extension Ring
- Material: Super High Impact PVC-U
- Conduit Size: 25mm
- Colour: White
- Application: Extends the depth of round conduit boxes
✅ Choose the MER3WH Extension Ring for added space and dependable depth adjustment in 25mm conduit installations!

Ean Code | 5020837269109 |
Product | PVC Extension Ring |
Type | Circular |
Colour | White |
Diameter | 25 mm |
Mounting | Surface |
Material | PVC-U |
Standards | BS 4607 BS EN 61386-1:2008 BS EN 61386-21:2004+A11:2010 and BS EN 61386-25:2011 where applicable |
Ce Approved | N |
Fixings Included | N |
Nominal Width | 25 mm |
Nominal Width B | 25 mm |
Included Fixings | N |
Delivery Options:
- PRIORITY DELIVERY – Next Working Day (All items in stock and ordered before 3 pm) - £7.08 inc-VAT. (£5.90 ex-VAT)
- Orders Over £100 (before VAT): We offer free standard shipping on all orders shipped to UK mainland addresses
- Orders under £100 (before VAT): Our standard delivery fee to UK mainland addresses is £5.90 ex-VAT (£7.08 inc-VAT)
*Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £12 ex-VAT for all orders (Prices subject to change).
Items requiring specialist shipping:
- Orders containing Solar Panels, Batteries and/or Inverters: Up to 50 qty will be dispatched on a pallet and incur a £120 ex-VAT delivery charge**.
**Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £180 ex-VAT (Prices subject to change).
Contact us if you have any further questions.