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The OsmaDrain Access Gully (4D850) is designed for professional drainage installers and contractors working on foul and surface water gravity drainage systems. It provides a highly reliable, roddable, and trapped solution for effective water management, featuring a convenient rotating top for easier installation alignment. While it excels in versatility and ease of maintenance, installers should note that it is specifically designed for 110mm pipework and requires careful adherence to standard drainage depth regulations.
| Model Part Number | 4D850 |
|---|---|
| Brand | Osma |
Yes, it is designed for both foul and surface water gravity drainage systems.
Yes, it is certified for use at installation depths of up to 10 metres.
The rotating top allows you to align the square grid with surrounding ground surfaces, such as patio pavers, without rotating the main gully body.
Yes, the unit is fully trapped to prevent foul odors from escaping the drainage system.
Maintenance is simple; the grid can be removed to allow for rodding access to the drainage pipework and to clean out the internal trap.
Yes, the 110mm plain ended outlet is designed for universal compatibility with standard gravity drainage pipe systems.
Clear the grid of debris and ensure the internal trap is free from blockages.
Check that the internal trap is filled with water; if the gully has been dry for a long period, add water to reset the seal.
Check the pipe seal for debris or damage; ensure the 110mm pipe is fully pushed home into the outlet socket.
Ensure that the excavation is prepared with appropriate granular bedding material to support the gully base. Verify that the 110mm pipework is correctly chamfered and lubricated before insertion into the plain-ended outlet to ensure a watertight seal. Once installed, backfill around the gully with care to avoid displacement. For ongoing care, periodically remove the grid to clear any collected silt or organic debris that may have bypassed the grate. Ensure that no heavy vehicles are positioned directly over the gully unless it has been protected by a suitable load-bearing cover assembly.
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