Description
The DU079 450x450x100mm D400 ductile iron solid top manhole cover is a compact heavy-duty access cover designed for carriageways, utility infrastructure, commercial developments and other areas where cars and lorries have access. Rated D400 (Group 4) and capable of withstanding a 400kN (40 tonne) test load, it provides a robust solution where a smaller 450 × 450mm chamber opening requires a heavy-duty access cover.
Featuring a 450mm × 450mm clear opening, 550 × 550mm overall base size and 100mm deep frame, the DU079 combines a relatively compact footprint with the performance required from a D400 access cover. This makes it particularly useful for smaller utility chambers, inspection points and service access chambers located within trafficked areas. The technical drawing on page 2 confirms the 550 × 550mm overall base dimensions around the 450 × 450mm clear opening.
The DU079 incorporates SmartGrip™ anti-slip surface technology, providing a PSRV value greater than 70, together with three-point suspension for non-rock stability. Manufactured from spheroidal graphite ductile iron to EN 1563:2018, the cover is black coated and carries BSI Kitemark certification, with the manufacturer stating that it exceeds the requirements of BS EN124-2:2015.
The 450 × 450mm clear opening is a commonly used access chamber size and the DU079 provides a D400 option for both new installations and replacement projects where heavy vehicle loading is expected. When replacing an existing 450 × 450mm cover, always check the overall frame dimensions as these can vary between manufacturers. The DU079 has a 550 × 550mm overall base size and 100mm frame depth.
The DU079 also meets the manufacturer’s stated depth-of-insertion requirements of BS EN124-2:2015, CD534 and BS7903, and complies with the Manual for Contract Highway Works, Series 500 and the requirements of CD534.
Suitable for utility chambers, carriageways, commercial developments, industrial sites, service yards, infrastructure projects and smaller access chambers, the DU079 provides a useful combination of compact dimensions and D400 load performance.
Looking for other options? Browse our full range of D400 Manhole Covers or explore our 450×450 Manhole Covers to compare alternative load ratings, brands and specifications.
Key Features
- D400 (Group 4) heavy-duty access cover
- Tested to 400kN (40 tonnes)
- 450 × 450mm clear opening
- 100mm deep frame
- 550 × 550mm overall base size
- Compact D400 solution for smaller access chambers
- Manufactured from high-strength ductile iron
- Spheroidal graphite cast iron to EN 1563:2018
- SmartGrip™ anti-slip surface technology
- PSRV value of >70
- Three-point suspension for non-rock stability
- Black coated finish
- BSI Kitemark certified
- Exceeds requirements of BS EN124-2:2015
- Meets depth-of-insertion requirements of BS EN124-2:2015, CD534 and BS7903
- Complies with Manual for Contract Highway Works, Series 500
- Meets requirements of CD534
- Long-life recyclable ductile iron construction
- Optional badged, locked, vented and sealing plate configurations available.
Typical Applications
- Carriageways
- Hard shoulders
- Smaller utility chambers
- Inspection chambers
- Service access chambers
- Cable and utility infrastructure
- Commercial developments
- Industrial estates
- Service yards
- Distribution and logistics sites
- Civil engineering projects
- Highway infrastructure
- Local authority infrastructure
- New chamber installations
- Replacement 450 × 450 access covers
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 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 03338803558 or info@drainageandcivilsdirect.co.uk to provide professional guidance.
By completing your order, you acknowledge and accept these delivery and return terms.
- Product Code: DU079
- Product Type: Ductile Iron Access Cover
- Load Rating: D400 (Group 4)
- Test Load: 400kN (40 tonnes)
- Clear Opening: 450 × 450mm
- Overall Base Size: 550 × 550mm
- Frame Depth: 100mm
- Material: Ductile Iron
- Cast Iron Specification: Spheroidal Graphite Cast Iron to EN 1563:2018
- Finish: Black Coated
- Surface Technology: SmartGrip™
- PSRV: >70
- Suspension: Three Point Suspension
- Certification: BSI Kitemark
- Standard: EN124-2:2015
- Depth of Insertion: Meets BS EN124-2:2015, CD534 and BS7903 requirements
- MCHW: Manual for Contract Highway Works, Series 500
- DMRB / CD534: Meets CD534 requirements
- Optional Extras: Badged, Locked, Vented and Sealing Plate versions available.
What size chamber does a 450×450 manhole cover fit?
The DU079 is designed for a 450mm × 450mm clear opening. When replacing an existing cover, measure the clear internal chamber opening rather than the external brickwork. The DU079 itself has an overall base size of 550 × 550mm and a frame depth of 100mm.
Will the DU079 replace my existing 450×450 manhole cover?
Potentially, yes. The DU079 is designed around a 450 × 450mm clear opening, making it suitable for many new and replacement installations. However, frame dimensions can vary between manufacturers, so check the existing overall frame dimensions against the DU079’s 550 × 550mm overall base size and 100mm depth before ordering.
Is the DU079 suitable for carriageways?
Yes. The DU079 is a D400 (Group 4) access cover designed for areas where cars and lorries have access, including carriageways and hard shoulders. It is capable of withstanding a 400kN (40 tonne) test load.
Is a 450×450 D400 cover suitable for a small utility chamber?
Yes. The DU079 combines a relatively compact 450 × 450mm clear opening with a D400 load classification, making it a useful option for smaller utility, inspection and service access chambers located within areas subject to vehicle traffic.
Is the DU079 suitable for highway projects?
The manufacturer states that the DU079 meets the requirements of CD534 and the Manual for Contract Highway Works, Series 500, together with the relevant depth-of-insertion requirements of BS EN124-2:2015, CD534 and BS7903. Final suitability should always be checked against the specification for the individual highway project.
Does the DU079 comply with BS EN124-2:2015?
Yes. The manufacturer states that the DU079 exceeds the requirements of BS EN124-2:2015 and is tested and certified by BSI. The product carries BSI Kitemark certification.
What is SmartGrip technology?
The DU079 features the manufacturer’s SmartGrip™ surface technology. Its pattern is designed to provide enhanced slip resistance, with the datasheet stating a PSRV value greater than 70, independently assessed by a UKAS-accredited third party.
Can the DU079 be supplied locked, vented or badged?
Yes. The manufacturer lists badged, locked, vented and sealing plate versions as optional configurations. Availability should be confirmed when ordering if your project requires one of these options.
What happens if I order the wrong size?
Large ductile iron access covers can incur return haulage and restocking costs. For replacement projects, check the clear opening, overall frame dimensions and frame depth before ordering. If you’re unsure, send us the existing chamber and frame dimensions and we can help check suitability.
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