D400 Heavy Vehicles

D400 Manhole Covers for Heavy Vehicle and Highway Applications

Our D400 manhole covers are built to perform in areas subject to heavy vehicular loads, such as lorry yards, service areas, industrial estates, and commercial developments. Engineered for strength and durability, these covers provide reliable access protection for drainage and inspection chambers under demanding site conditions.

Manufactured from high-strength ductile iron, D400 covers deliver excellent resistance to impact, wear, and corrosion. All products are tested to BS EN 124-2 Class D400, ensuring long-term safety and performance in high-traffic environments. Options include solid top, recessed, and locking designs to suit a range of finishes and security requirements.

At Drainage & Civils Direct, we supply D400 heavy-duty manhole covers with competitive trade pricing, fast nationwide delivery, and expert support to help you specify the right cover and frame for your project.

Is D400 the right choice?

D400 manhole covers are typically selected where regular vehicle traffic is expected, including driveways used by vans, shared access roads and commercial areas.
If you are replacing a lighter cover that feels unstable or has previously failed, upgrading to D400 provides additional strength and long-term reliability.

Not sure if D400 is right? Read our guide on how to choose the right manhole cover.

For lighter duty domestic applications, view our B125 manhole covers.