Covers & Grates for Manhole/Drainage Access

Choosing the Right Covers and Grates

A well-functioning access point requires the right top component to protect underground piping and ensure a safe environment above ground. Depending on whether the unit needs to allow stormwater to pass through or remain completely sealed, there are various types of covers and grates tailored to specific well types and environments.

Types of Covers and Grates

• Solid Covers: Primarily used for inspection chambers, cleanout chambers, and septic tanks/settling tanks where it is necessary to prevent surface water, dirt, and odors from entering or escaping. Available in smooth or patterned designs, and with screw holes for added child safety and stability.
• Flat Grates: Suitable for areas where surface water needs to be directed into a chamber—such as courtyards, walkways, or drained ground surfaces—while preventing larger particles and branches from entering.
• Dome Grates: Designed with a curved profile to prevent leaves and debris from obstructing water flow. The domed shape ensures that water continues to drain even if debris accumulates around the edge of the grate.
• Solid Plastic Covers and Plugs: Lightweight and convenient covers for riser rings, as well as for indoor or sheltered ground-level installations where corrosion resistance is a priority.

Things to Consider Before You Buy

• Dimensions and Fit: Always carefully measure the inner and outer diameter of the frame or telescopic riser pipe (common standard sizes include 225 mm, 300 mm, and 400 mm) to ensure the cover sits securely without any play.
• Load Requirements: Consider the type of traffic the area will be subjected to. Pedestrian areas and gardens can often accommodate non-vehicular grates or lighter-duty covers, whereas areas subject to vehicular traffic require heavy-duty models made of ductile iron or cast iron.
• Locking and safety: If the manhole is located in a public area or where children are present, models with screw or bolt-down locking mechanisms are an important choice to prevent accidental opening.