Description
The DU078 750x750x100mm D400 ductile iron solid top manhole cover is a premium heavy-duty access cover designed for carriageways, utility infrastructure, commercial developments and industrial environments where regular heavy vehicle traffic is expected. Manufactured from high-strength spheroidal graphite cast iron, it complies with BS EN124-2:2015, carries BSI Kitemark certification, and meets the requirements of CD534 for demanding infrastructure projects.
Featuring a 750mm × 750mm clear opening, 100mm deep frame, SmartGrip® anti-slip surface and three-point suspension system, the DU078 provides outstanding stability, durability and long-term performance under repeated traffic loading. Its robust design makes it an excellent choice for both new civil engineering projects and the replacement of existing access covers in high-traffic environments.
The 750 × 750mm size is one of the UK’s most commonly specified D400 manhole cover sizes for both new installations and replacement projects. It is frequently selected as a replacement D400 manhole cover for existing utility chambers, carriageways, water treatment works and commercial developments. While the clear opening is standard, overall frame dimensions can vary between manufacturers, so we recommend checking both the clear opening and overall frame size before ordering to ensure compatibility.
Suitable for utility chambers, water treatment works, cable pits, carriageways, commercial developments and industrial sites, the DU078 provides reliable access to underground services whilst withstanding demanding operating conditions. Whether you’re replacing an existing access cover or specifying a new installation, the DU078 delivers the strength, durability and long service life expected from a premium D400 ductile iron manhole cover.
Key Features
- D400 load rating tested to 400kN (40 tonnes)
- 750 × 750mm clear opening
- Heavy-duty 100mm deep frame
- Manufactured from high-strength ductile iron
- SmartGrip® anti-slip surface technology
- Three-point suspension system for non-rock stability
- Black coated finish
- BSI Kitemark certified
- Manufactured to BS EN124-2:2015
- Meets the requirements of CD534
- Complies with BS7903 and Manual for Contract Highway Works (Series 500)
- Optional locking, vented, badged and sealing plate versions available.
Typical Applications
- Carriageways
- Hard shoulders
- Utility chambers
- Water treatment works (WTW)
- Wastewater treatment works
- Water utility infrastructure
- Cable pits
- Commercial developments
- Industrial estates
- Distribution centres
- Service yards
- Loading bays
- Civil engineering projects
- Highway infrastructure
- Local authority projects
- Infrastructure maintenance
Looking for other options? Browse our full range of D400 Manhole Covers or explore our 750×750 Manhole Covers to compare alternative brands, depths and specifications for your project.
All manhole covers, gully covers, and frames are supplied through an external supplier. Delivery charges will be calculated in your cart at checkout. Due to the size and weight of these items, deliveries are typically made using an artic vehicle.
Returns are subject to a restocking fee and haulage (consumer cost), which will be deducted from your refund.
Please review all product specifications before placing an order. If you require assistance selecting the correct product, our team is available on 03338803558Â or info@drainageandcivilsdirect.co.uk to provide professional guidance.
By completing your order, you acknowledge and accept these delivery and return terms.
- Product Code: DU078
- Load Rating: D400 (Group 4)
- Clear Opening: 750 × 750mm
- Overall Frame Size: 850 × 850mm
- Frame Depth: 100mm
- Material: Ductile Iron (Spheroidal Graphite Cast Iron)
- Surface Finish: Black Coated
- Surface Pattern: SmartGrip® Anti-Slip Technology
- Certification: BSI Kitemark
- Standard: BS EN124-2:2015
- Load Test: 400kN (40 Tonne)
- Suspension System: Three Point Suspension
- Complies With: CD534, BS7903 and Manual for Contract Highway Works (Series 500)
- Optional Extras: Badged, Locked, Vented and Sealing Plate options available.
5
What size chamber does a 750×750 manhole cover fit?
The DU078 is designed for chambers with a 750mm × 750mm clear opening. Always measure the internal chamber opening rather than the external brickwork or surrounding structure to ensure the correct fit before ordering.
Will this replace my existing 750×750 D400 manhole cover?
In many cases, yes. The DU078 is designed for a 750 × 750mm clear opening, making it suitable for many standard chamber openings used throughout the UK. However, overall frame dimensions can vary between manufacturers, so we recommend checking both the clear opening and overall frame size before purchasing. If you’re unsure, contact our team and we’ll be happy to confirm compatibility.
Is this manhole cover suitable for carriageways?
Yes. The DU078 is manufactured to BS EN124-2:2015, carries BSI Kitemark certification, meets the requirements of CD534, and is suitable for carriageways, hard shoulders and other areas subjected to regular heavy vehicle traffic. Always ensure the specification meets the requirements of your project or highway authority.
Can this manhole cover be used for water treatment works and utility infrastructure?
Yes. The DU078 is well suited to water treatment works (WTW), wastewater treatment works, utility chambers, cable pits and wider utility infrastructure where a heavy-duty D400 access cover is required. It is also suitable for commercial and civil engineering projects.
Is the DU078 compliant with BS EN124-2:2015?
Yes. The DU078 is manufactured in accordance with BS EN124-2:2015, carries BSI Kitemark certification, and meets the requirements of CD534, providing confidence in its long-term performance for demanding infrastructure applications.
Can this manhole cover be supplied with locking or vented options?
Yes. The DU078 is available with optional locking, vented, badged and sealing plate configurations, allowing it to be specified for a wide range of commercial, utility and highway applications.
What happens if I order the wrong size?
Large ductile iron manhole covers are subject to restocking and haulage charges if returned. If you’re unsure which cover you require, contact our team with your chamber dimensions before placing your order and we’ll be happy to confirm the correct product.
How heavy is this manhole cover?
The DU078 is a heavy-duty D400 ductile iron manhole cover designed for demanding applications. Due to its weight, suitable lifting keys should always be used, and safe manual handling procedures should be followed. For larger installation projects, mechanical lifting equipment may also be appropriate.
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