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Professional Building Supplies£165.85Visit shop Floplast And Clark-Drain Floplast Inspection Chamber Set With 46Mm Deep Block Paviour Cover - 450Mm Diameter
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B&Q£204.64Visit shop B&Q - 450mm Inspection Chamber Set With 46mm Recessed 580mm Square Paviour Cover And Frame
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The FloPlast 450mm Inspection Chamber Set (D450MH5) is designed for contractors and homeowners managing domestic drainage systems who need a reliable, modular access point. Its primary benefit is the combination of an adjustable-depth design and a 5-tonne load-rated cover, making it ideal for residential driveways and landscaped areas. A key caveat is that while the unit is highly modular, exceeding the standard depth requires the purchase of additional components, and the riser sections must be cut with precision to ensure a proper seal.
| Model Part Number | D450MH5 |
|---|---|
| Brand | FloPlast and Clark-Drain |
No, this chamber is rated for a 5-tonne load, which is suitable for standard domestic driveways but not for heavy goods vehicles or public roads.
The set reaches 822mm as supplied, but it can be extended up to 1200mm using additional D916 riser components.
While a power saw is possible, a fine-toothed hand saw is recommended for greater control and to ensure a square, smooth edge for the sealing gasket.
The blanking plugs are intended to be removed for permanent connections; once removed, they are generally not designed to be re-inserted to create a water-tight seal.
The recessed cover is 580mm square with a depth of 46mm, allowing for various paving or block-paving infill materials.
Adjust the depth of the riser sections by cutting them further or using shims on the base layer to achieve the correct finished height.
Check that the cover frame is properly sealed into the surrounding concrete or paving mortar to prevent surface runoff from leaking into the chamber.
To ensure a long-lasting installation, always place the base section on a firm, level granular bed. When assembling the risers, verify that all seals are seated correctly to prevent groundwater ingress. The recessed cover is designed to be filled with paving materials to match the surrounding surface; ensure the infill material is properly bonded to the frame to prevent rattling or movement under vehicle traffic. To maintain the system, keep the lifting keys in a secure, known location and perform annual inspections to clear any silt buildup within the base channel.
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