320mm Diameter Square Manhole Cover & Frame

Product Description

This 320mm Diameter Square Manhole Cover & Frame is a strong, dependable solution whenever you need a square surface finish over a round chamber opening. Designed for inspection chambers where square grates or aesthetic drainage surfaces are required above a circular lid, it converts the opening neatly while maintaining access and safety.

The cover and frame are built from durable PVC, designed to withstand pedestrian loads (rated to 15 kN), moisture, and underground conditions. The total dimensions of the panel are approximately 380mm × 380mm × 30mm (L × W × H), which gives a solid square surround while fitting over a 320mm diameter round frame or riser. It includes a round opening in its center (clear opening about 300mm) to match inspection chamber lids and risers of that diameter.

Ideal for paths, patios, driveway edges, or landscaped areas where square access panels are preferred, this cover and frame combination ensures a flush, neat appearance while providing full access for inspection, cleaning, or maintenance of underground drainage runs. Supplied with a robust frame and a matching cover plate, the unit helps eliminate the typical mismatch between round chamber risers and square surface finishes.

Key Features

• Square-to-Round Design: Square frame (≈ 380mm) with a round opening (≈ 300mm) to house standard inspection chamber lids.

• 320mm Diameter Round Interface: Fits over the top of 320mm circular chamber / riser units.

• Durable PVC Construction: Engineered for underground exposure and frequent access.

• Load Rating: Suitable for pedestrian areas — tested to about 15 kN load.

• Height / Depth: Approx. 30mm overall, enough to provide solid cover while being low profile.

• Colour: Black finish.

• Guarantee: Comes with a 10-year manufacturer guarantee.

Benefits

• Neat aesthetic integration: Square top surface fits beautifully with square paving, tiles or landscaping, preventing unsightly round lids in square surrounds.

• Maintains access & functionality: Though the surround is square, the clear round opening allows full access for manhole / chamber inspection and cleaning.

• Strong & safe: Certified for pedestrian use — the load rating ensures durability and safety under walkways.

• Reduced tripping hazards: Slight height (≈30mm) and flush installation reduce trip risks compared to bulky lids or mismatched frames.

• User convenience: Frame plus cover included gives you a complete unit, so no need to source parts separately.

• Long-term reliability: PVC body resists corrosion, moisture ingress and environmental stress; backed by a long guarantee.

For more drainage fittings, see here.