Outdoor Manhole Covers & Accessories

Guide to choosing the right manhole cover and accessories

Selecting the right manhole cover is primarily a matter of safety, functionality, and the load-bearing requirements of the surrounding ground. Whether it is an inspection chamber, a stormwater manhole, or a drainage pit, the cover serves as the visible link between the underground piping system and the surface above.

Solid lid or grate strainer

The type of top you choose depends on the specific function of the manhole:

• Solid manhole lids: Ideal for inspection chambers, wastewater manholes, and cleanout pits where you want to prevent odors, rainwater, or leaves from entering the system.
• Strainers and grates: Primarily used for stormwater drains and gutters where surface water needs to be quickly diverted away from the ground surface while trapping larger particles.

Load classes: Non-trafficable vs. trafficable

One of the most important factors to consider before purchasing is the location of the drain and the weight load it will be subjected to:

• Non-trafficable covers: Suitable for protected garden areas, flowerbeds, and pedestrian-only walkways. These are often lighter in weight and easy to lift for inspection.
• Trafficable covers: Necessary for driveways, parking areas, and courtyards where passenger cars or heavier vehicles pass. Always check the specified load class (e.g., Class A for lighter loads or B125 for passenger car traffic).

Essential accessories for a watertight and stable installation

To ensure the drain remains watertight and withstands ground movement over time, the right accessories are required:

• Rubber seals and sealing strips: Ensure a watertight joint between the drain pipe and the cover, keeping out sand, roots, and groundwater.
• Load-distributing rings and concrete rings: Relieve pressure on the plastic drain itself and distribute ground pressure evenly around the structure when subjected to vehicle traffic.
• Leak-proofing components: Provide an extra layer of protection against unwanted moisture and surface water ingress.

Things to consider before purchasing

• Carefully measure the inner and outer diameter of the drain to ensure the dimensions match the connection specifications of the cover.
• Check whether the ground surface around the manhole will be paved with asphalt, paved with stone, or sown with grass, as this affects the type of frame and range of adjustment required.
• Select lockable covers where there is a risk of unauthorized access or where extra child safety is required.