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Professional Building Supplies£147.53Visit shop Floplast And Clark-Drain Floplast Inspection Chamber Set With 80Mm Deep Block Paviour/ Paving Slab Cover - 450Mm Diameter
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B&Q£185.40Visit shop B&Q - Inspection Chamber Set 450mm Diameter With 80mm Recessed Block Paving Cover And 580mm Square Frame
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The D450MH4 inspection chamber set is an essential component for domestic drainage systems, designed for homeowners and contractors who require a robust, adaptable solution for maintenance access. It offers a high 10-tonne load rating and a flexible, height-adjustable design, making it perfect for installation under block-paved driveways. However, note that it requires professional-grade excavation and precise leveling to ensure proper flow and long-term durability.
| Model Part Number | D450MH4 |
|---|---|
| Brand | FloPlast |
The cover is rated for a 10-tonne load, making it suitable for domestic driveways.
The set provides an overall depth of 856mm from invert to the top of the cover; additional risers may be required for significantly deeper runs.
The set includes the base, two risers, the recessed cover, frame, and lifting keys. You will need bedding materials, mortar, and pipe connectors separately.
The risers are made of durable plastic and can be easily trimmed using a fine-toothed saw.
When installed correctly using standard industry jointing methods, the chamber is designed to be effectively sealed against groundwater.
The recessed cover is designed specifically to fit 65mm thick block paving or slabs.
Adjust the bedding mortar depth beneath the pavers within the tray or trim the risers slightly if the frame is seated too high.
Ensure the integral plugs are fully removed and check the pipe seal for debris or misalignment.
Clear any accumulated grit or mortar from the edges of the frame to prevent the cover from binding.
Installation requires a level, firm base of compacted hardcore or concrete. Ensure the base unit is correctly positioned so that the invert level aligns with the incoming pipework. When adjusting the height, use a fine-toothed saw to cut the riser sections cleanly, ensuring the cut is perpendicular to the pipe wall. The connection points between the base, risers, and frame should be sealed according to local drainage standards to prevent groundwater ingress. To care for the unit, periodically remove debris from the channel to prevent blockages. Keep the lifting keys in a labeled location to ensure they are available for future maintenance.
