D400 GRP Trench Cover & Gully Grid – Heavy-Duty, High-Performance Drainage Solution

Relinea’s D400 GRP Trench Covers and Gully Grids are the ultimate solution for heavy-duty drainage requirements in high-traffic areas. Designed with innovation and durability in mind, these covers provide a superior alternative to traditional metal counterparts. Whether it’s a busy roadway, industrial facility, or commercial car park, the D400 range delivers long-lasting performance, safety, and structural integrity. Also available with C250 rating to provide a high-strength, lightweight option for Group 3 Class environments.

Manufactured using high-strength GRP, our trench covers offer a modern composite solution that is lightweight, corrosion-resistant, and easy to install. Unlike traditional cast iron or steel covers, GRP will not rust, warp, or degrade over time, even in the most aggressive environmental conditions. The result is a drainage system that stands up to both time and traffic.

Every cover is meticulously engineered to meet the highest safety and load-bearing standards. With a service life exceeding 30 years, the C250 and D400 cover system represents an investment in safety, sustainability, and long-term cost savings. It’s the perfect blend of form and function – strong enough to withstand constant vehicle loads, yet light enough to allow safe manual handling and simplified maintenance.

Why choose our Heavy Duty GRP Trench Covers?

High Load Capacity: Certified to C250 and D400 under EN124-5:2015, designed to handle 25 tonne loads, and 40 tonne loads for carriageways, hard shoulders, and high-traffic environments.

Lightweight & Easy to Install: At just 16.5 kg, it offers rapid installation and safer handling, significantly reducing labour and equipment costs.

Unmatched Durability: Corrosion-resistant against a wide range of chemicals, perfect for coastal, industrial, or wet environments.

Temperature Resilient: Maintains performance from -50°C to +150°C, making it ideal for extreme climates and temperature fluctuations.

Non-Conductive: GRP is non-conductive, making it perfect for use near live electrical plants or equipment. 

Anti-Slip Safety Surface: Precision-engineered anti-skid tread pattern helps prevent slips, enhancing pedestrian and vehicular safety.

Enhanced Security: Equipped with a lockable, tamper-resistant design using stainless steel bolts and a removable EPDM sealing system for secure yet accessible maintenance.

Relinea – Reliable, Resourceful

We navigate our clients through their specific GRP technical issues to find composite cost reduction solutions that are flexible, long-lasting, and easy to install. With one of the largest dedicated composite design teams in the sector combined with 20 years of experience in the manufacture of GRP products we are best placed to provide truly innovative, sustainable solutions.

Give us a call today on 028 9447 0010 or email us at info@relinea.com with your project specification to discuss your requirements and request a free quotation and proposal.