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Amazon£68.90Visit shop Wavin Osma Underground Pvc Sealed Cover And Frame - Circular 250Mm 4D325 Inspection
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Travis Perkins£88.40Visit shop Osma 250mm Shallow Inspection Chamber Round Cover and Frame 4D325
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The Osma 250mm Shallow Inspection Chamber (4D325) is designed for contractors and homeowners installing drainage systems in non-trafficked or landscaped areas. It offers a reliable, sealed solution for accessing underground pipes at depths up to 0.6m, providing a secure load-bearing cover for both adoptable and non-adoptable systems. A key caveat is that this unit is restricted to non-trafficked locations and requires a concrete collar to achieve its maximum load rating of 10kN.
| Colour | Black |
|---|---|
| Model Part Number | 4D325 |
| Brand | Osma |
No, this product is specifically designed for non-trafficked locations and cannot support vehicular weight.
The chamber is rated for a maximum invert depth of 0.6m.
This is a standard round cover and frame designed for easy access; it does not feature an integrated locking mechanism.
Yes, this unit can be installed internally, provided the floor finish is compatible and it is installed according to building regulations.
Yes, to achieve the 10kN load capacity, a concrete collar must be installed around the frame.
Clean out any grit or debris from the frame groove and ensure the frame itself has not shifted during backfilling.
Verify that a concrete collar was installed correctly around the frame to support the load; if not, you must excavate and add the support.
To install, ensure the ground is level and the pipework is correctly positioned at a depth of no more than 0.6m. Use a high-quality concrete mix to create the required support collar around the frame to ensure it meets the 10kN load rating. The unit is compatible with standard 250mm drainage accessories. For care, keep the cover clear of debris to ensure easy removal during routine inspections. Regularly check that the seal remains intact to prevent ingress, and ensure the cover is always seated flush within the frame to maintain load stability.
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