Description
The 1220x675x100mm D400 Highways ductile iron manhole cover is a heavy-duty double triangular access cover specifically designed for highway use and areas of heavy traffic. Rated to D400 under BS EN124:2015 and Kitemarked, it provides a robust access solution for carriageways and highway infrastructure where a large rectangular clear opening is required.
Featuring a 1220 × 675mm clear opening, 1350 × 815mm overall frame size and 100mm frame depth, this model provides generous access to larger underground chambers while retaining a D400 highway specification. Its double triangular lift-out cover arrangement divides the large opening into manageable cover sections rather than using a single large cover.
Importantly for highway specifications, the manufacturer states that the product is CD534/HA104 compliant and compatible for use with all mainstream D400 composite chamber systems. This makes it particularly relevant for highway drainage, utility infrastructure, communications chambers, cable chambers and other access points incorporated within heavily trafficked areas.
Looking for other options? Explore our 1200×675 Manhole Covers to compare alternative load classes, manufacturers, frame depths and specifications.
1200×675 and 1220×675 Manhole Covers
1200 × 675mm is widely used as a generic industry reference for this large rectangular manhole cover format, while individual manufacturers and project drawings can specify slightly different actual clear openings. This particular product has a certified clear opening of 1220 × 675mm. When replacing an existing 1200 × 675 or 1220 × 675 D400 manhole cover, always check the actual chamber opening and overall frame dimensions rather than relying on the nominal size alone.
This distinction is particularly important for replacement projects because the manufacturer’s datasheet specifies an actual 1350 × 815mm overall frame size. The datasheet also notes that tread patterns and over-frame dimensions may vary, so dimensions should always be checked against the current product specification before installation.
Suitable for highways, carriageways, utility chambers, composite chamber systems, cable pits, communications infrastructure and other heavily trafficked civil engineering applications, this 1220 × 675mm D400 cover provides a purpose-designed solution where a larger rectangular highway access opening is required.
Need a deeper frame? View the 1220x675x150mm D400 Highways Manhole Cover for the equivalent 150mm deep-frame option.
Looking for other options? Browse our full range of D400 Highways Manhole Covers to compare alternative manufacturers, frame depths and specifications.
Key Features
- D400 heavy-duty load classification
- Designed for highway use and areas of heavy traffic
- 1220 × 675mm clear opening
- Commonly associated with the industry’s 1200 × 675mm nominal size
- 1350 × 815mm overall frame size
- 100mm frame depth
- Double triangular lift-out covers
- BS EN124:2015 Kitemarked
- CD534/HA104 compliant
- Compatible with all mainstream D400 composite chamber systems
- Large rectangular access opening
- Suitable for new installations and replacement projects
- Bespoke badging available, including FW/SW
- Optional sealing plate available
- 150mm deep-frame version also manufactured under reference MDD12067DT15.
Typical Applications
- Highways
- Carriageways
- Areas of heavy traffic
- Highway drainage infrastructure
- Highway utility chambers
- Composite chamber systems
- Cable pits
- Electrical utility chambers
- Telecommunications chambers
- Communications infrastructure
- Water utility infrastructure
- Civil engineering projects
- Large rectangular access chambers
- New highway installations
- Replacement 1200 × 675 / 1220 × 675 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.
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.
- Product Reference: MDD12067DT10
- Product Type: Double Triangular Ductile Iron Manhole Cover
- Load Classification: D400
- Clear Opening: 1220 × 675mm
- Nominal / Industry Reference Size: 1200 × 675mm
- Overall Frame Size: 1350 × 815mm
- Frame Depth: 100mm
- Cover Configuration: Double Triangular – Lift Out
- Standard: BS EN124:2015
- Certification: Kitemarked
- Highway Compliance: CD534/HA104 Compliant
- Chamber Compatibility: Mainstream D400 Composite Chamber Systems
- Optional Extras: Bespoke Badges (FW/SW etc.) and Sealing Plate
- Alternative Depth: 150mm – MDD12067DT15
Is this a 1200×675 or 1220×675 manhole cover?
The actual certified clear opening of this product is 1220 × 675mm. However, 1200 × 675mm is commonly used as a nominal or generic industry reference for this large rectangular cover format. For replacement projects, do not rely on the nominal description alone — check the actual clear opening and overall frame dimensions before ordering.
What size chamber does the 1220×675 manhole cover fit?
The MDD12067DT10 has a 1220 × 675mm clear opening, 1350 × 815mm overall frame size and 100mm frame depth. These dimensions should be checked against the chamber and existing installation, particularly when replacing a cover from another manufacturer.
What is the difference between the 100mm and 150mm versions?
Both versions have the same 1220 × 675mm clear opening, 1350 × 815mm overall frame size, D400 classification and double triangular configuration. The difference is frame depth: MDD12067DT10 has a 100mm frame, while MDD12067DT15 has a 150mm frame. Select the version that matches the project specification or existing installation.
Is this manhole cover suitable for highways?
Yes. The manufacturer’s datasheet specifically identifies this range for “Highway Use & Areas of Heavy Traffic”. It is D400 to BS EN124:2015, Kitemarked and stated as CD534/HA104 compliant.
Is this manhole cover CD534 compliant?
Yes. The manufacturer’s datasheet specifically lists the product as CD534/HA104 compliant, making this an important distinction from products where highway suitability needs to be assessed more cautiously against an individual specification.
What does double triangular mean?
The cover uses a double triangular lift-out arrangement rather than one large single-piece cover. The datasheet drawing shows the rectangular opening divided into triangular cover sections, providing access across the larger 1220 × 675mm chamber opening.
Can this cover be used with composite chamber systems?
Yes. The manufacturer specifically states that this range is compatible for use with all mainstream D400 composite chamber systems, making it suitable for a range of highway and utility chamber installations.
Can this cover be supplied with bespoke badging or a sealing plate?
Yes. The listed options include bespoke badges, such as FW/SW identification, and a sealing plate. If either option is required for a project, availability and lead time should be confirmed before ordering.
Will this replace an existing 1200×675 D400 manhole cover?
Potentially, but the dimensions must be checked. A cover may be described on a drawing or existing specification as 1200 × 675mm, while the actual manufactured opening can differ. This product has a 1220 × 675mm clear opening and 1350 × 815mm overall frame, and the manufacturer itself notes that over-frame dimensions may vary.
What happens if I order the wrong size or depth?
Large-format D400 covers can incur significant return haulage and restocking costs. Before ordering, check the clear opening, overall frame dimensions and frame depth. For this model, those dimensions are 1220 × 675mm clear opening, 1350 × 815mm overall frame and 100mm depth. If you’re unsure, send us your dimensions or project drawing and we can help check the specification.
There are no reviews yet.