D400
D400 covers for trafficked areas.
Heavy-duty ductile iron and reinforced composite access covers rated to D400 load class — built for roads, highways and industrial areas with minimal maintenance.

At a glance
| Specification | Value |
|---|---|
| Load class | D400 |
| Material | Ductile iron / reinforced composite |
| Surface | Anti-slip, lockable |
| Compliance | BS EN 124 |
- UK WarehousedSame-week dispatch
- In-house engineersTechnical specs & support
- End-to-end BOM fulfilmentKitted, staged, delivered
- 120+ network buildersTrust Altnets to deliver
Key features
Built for how it gets installed.
D400 is one of the 11 cable types we carry across our Access Chambers range — chosen for the way you actually deploy.
D400 load class rated
Ductile iron or reinforced composite
Anti-slip surface and secure locking
Corrosion resistant and weatherproof
Why Altnets
The clever choice for network builders.
Deep UK stock
300,000+ sqft of warehousing and 4,000+ pallet positions — same-week dispatch on most line items.
Engineers, not order-takers
In-house technical team to validate specs, propose alternatives and de-risk your build before it ships.
BOM, kitted & staged
Multi-vendor consolidation, phased deliveries and project staging built into every order.
UK & worldwide reach
Air, sea and road freight with full export documentation and flexible incoterms for global rollouts.
Applications
Where d400 earns its keep.
Highways and carriageways
Industrial yards
Telecoms and utility chambers
Drainage networks
Have a question?
Let's get your network moving.
Tell us what you're building. We'll come back with a quote, lead times, and a plan.
- [email protected]
- +44 (0) 20 3997 8994
- Brighton · United Kingdom
More Access Chambers
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Secure chamber access, footway to heavy traffic.

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Stackable rings for variable depth.

Furniture Kits
Cable management, steps and duct entry.

Mobra Arms
Cable support inside the chamber.
MOBRAs
Adjustable frames that stabilise the chamber.
Mounting Kit
Fix equipment securely inside the chamber.
Steps
Safe, anti-slip entry into the chamber.
Sump Grates
Drain water, keep debris out.
Support Kit 1A
Structural reinforcement for chamber walls.
Toby Boxes (Plastic)
Compact housings for underground assets.