Description
The 1220x675x150mm 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 D400 to BS EN124:2015 and Kitemarked, it provides a robust large-format access solution for carriageways and highway infrastructure where demanding traffic conditions are expected.
Featuring a 1220 × 675mm clear opening, 1350 × 815mm overall frame size and heavy-duty 150mm frame depth, the MDD12067DT15 provides generous access to larger underground chambers. Its double triangular lift-out configuration divides the large rectangular opening into separate cover sections, providing a practical access arrangement for large highway and utility chambers.
Importantly for highway specifications, the manufacturer states that this range is CD534/HA104 compliant and compatible for use with all mainstream D400 composite chamber systems. This makes the 150mm version particularly relevant for highway utility chambers, communications infrastructure, cable chambers and other access points situated 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, overall frame dimensions and required frame depth rather than relying on the nominal size alone.
For the MDD12067DT15, the actual dimensions are 1220 × 675mm clear opening, 1350 × 815mm overall frame and 150mm frame depth. The manufacturer’s datasheet also notes that tread pattern and over-frame dimensions may vary, reinforcing the importance of checking the current specification when selecting a replacement.
Suitable for highways, carriageways, utility chambers, composite chamber systems, cable pits, telecommunications infrastructure and other heavily trafficked civil engineering applications, the MDD12067DT15 combines a large rectangular access opening with the deeper 150mm frame required by certain project and replacement specifications.
Looking for other options? Browse our full range of D400 Highways Manhole Covers to compare alternative manufacturers, frame depths and specifications.
Need a shallower frame? View the 1220x675x100mm D400 Highways Manhole Cover for the equivalent 100mm deep-frame option.
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
- Heavy-duty 150mm frame depth
- Double triangular lift-out configuration
- 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
- 100mm alternative available – MDD12067DT10
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
- Large service chambers
- Civil engineering projects
- 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: MDD12067DT15
- 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: 150mm
- 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
- 100mm Alternative: MDD12067DT10
s this a 1200×675 or 1220×675 manhole cover?
The actual clear opening of this product is 1220 × 675mm. However, 1200 × 675mm is commonly used as a generic or nominal industry reference for this large rectangular manhole cover format. For replacement projects, always check the actual clear opening, overall frame dimensions and frame depth rather than relying solely on the nominal size.
What size chamber does the 1220x675x150mm manhole cover fit?
The MDD12067DT15 has a 1220 × 675mm clear opening, 1350 × 815mm overall frame size and 150mm frame depth. These dimensions should be checked against the chamber or existing installation before ordering.
What is the difference between the 150mm and 100mm versions?
Both products have the same 1220 × 675mm clear opening, 1350 × 815mm overall frame size, D400 classification and double triangular configuration. The MDD12067DT15 has a 150mm deep frame, while the MDD12067DT10 has a 100mm deep frame. The appropriate version should be selected according to the project specification or existing installation.
Why would I choose the 150mm deep frame?
The 150mm version should be selected where the project specification or existing installation requires a 150mm frame depth. It provides the same 1220 × 675mm clear opening and overall frame footprint as the 100mm version, with frame depth being the principal dimensional difference between the two products.
Is this manhole cover suitable for highways?
Yes. The manufacturer specifically identifies the product range for highway use and areas of heavy traffic. It is D400 to BS EN124:2015, Kitemarked and stated by the manufacturer as CD534/HA104 compliant.
Is the MDD12067DT15 CD534 compliant?
Yes. The manufacturer’s datasheet specifically lists this D400 range as CD534/HA104 compliant. This makes highway compliance a genuine product feature here rather than something we’re inferring simply from its D400 load classification.
What does double triangular lift-out mean?
The product uses a double triangular lift-out cover arrangement rather than one large single-piece cover. This configuration provides access across the large rectangular chamber opening while dividing the cover into separate sections. The manufacturer specifically identifies the product as double triangular lift-out.
Can this manhole cover be used with composite chamber systems?
Yes. The manufacturer states that the product is compatible for use with all mainstream D400 composite chamber systems, making it suitable for a range of highway, utility and communications chamber installations.
Can the cover be supplied with bespoke badging or a sealing plate?
Yes. Available options listed on the datasheet include bespoke badging, such as FW/SW identification, and a sealing plate. Availability should be confirmed when ordering if these are required for a particular project.
What happens if I order the wrong size or frame depth?
Large-format D400 covers can incur significant return haulage and restocking costs. Before ordering, check the clear opening, overall frame dimensions and required frame depth. For the MDD12067DT15 these are 1220 × 675mm clear opening, 1350 × 815mm overall frame and 150mm depth. If you’re unsure, send us your dimensions or project drawing and we can help check the specification.
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