Clark-Drain T1G3 Recessed Manhole Cover 440×440mm – Shallow
£88.00
The Clark-Drain T1G3 is a shallow recessed manhole cover designed to create discreet access beneath paving, tiles, screed or concrete. Its recessed tray can be finished to coordinate with the surrounding surface, helping the access point blend into the completed area.
The cover measures 440×440×52mm overall and fits circular inspection-chamber openings of approximately 220–300mm. It features a 43.5mm-deep galvanised steel tray, polypropylene frame, rubber sealing gasket and a 5-tonne gross plated weight rating.
- Clark-Drain model T1G3
- 440×440×52mm overall size
- 43.5mm internal tray depth
- Fits circular openings from approximately 220–300mm
- Galvanised steel recessed tray
- Polypropylene frame
- Factory-fitted sealing gasket
- 5-tonne gross plated weight rating
- Lifting points for easier access
- UK Stock Held
- Fast Delivery TImes
- Secure Payments
Description
The Clark-Drain T1G3 is a shallow recessed manhole cover designed to provide discreet access to an inspection chamber beneath a finished floor or paved surface.
Instead of leaving a conventional solid cover visible, the recessed tray can be finished to coordinate with the surrounding paving, tiles, screed or concrete. This helps the access point blend into the completed area while remaining accessible for inspection and maintenance.
The T1G3 has an overall external size of approximately 440×440mm and a shallow internal tray depth of approximately 43.5mm.
Important sizing information
The stated 440×440mm measurement is the overall size of the frame. It is not the size of the opening underneath the cover.
The square-to-round frame is designed for circular inspection-chamber openings measuring approximately 220–300mm.
Before ordering, measure:
- The clear opening of the inspection chamber
- The available space around the chamber
- The required finished surface level
- The thickness of the intended tray infill
- The complete depth of the paving, tile and bedding system
Do not order solely from the visible dimensions of an existing cover.
Why choose the Clark-Drain T1G3?
The shallow design makes the T1G3 suitable for installations where the available build-up depth is limited.
Benefits include:
- Recessed design for a discreet finished appearance
- Suitable for circular openings from approximately 220–300mm
- Compact 440×440mm overall frame
- Shallow 43.5mm internal tray
- Fully galvanised steel recessed cover
- Durable polypropylene frame
- Factory-fitted rubber sealing gasket
- Integral lifting points
- 5-tonne gross plated weight rating
- Suitable for a range of compatible surface finishes
Recessed tray design
The recessed tray allows the visible surface of the cover to be finished in a material that coordinates with the surrounding area.
Depending on the installation and available tray depth, this may include:
- Porcelain paving
- Natural-stone paving
- Floor tiles
- Concrete
- Screed
- Other compatible infill materials
The complete surface build-up must fit within the available tray depth without interfering with the frame, lifting points or opening mechanism.
The weight of the finished tray should also be considered, particularly when using thick paving or dense natural stone.
Galvanised steel cover and polypropylene frame
The recessed tray is manufactured from galvanised steel and sits inside a polypropylene frame.
The frame has a square upper profile and a circular underside, allowing the cover to fit smaller circular inspection-chamber openings while providing a square visible finish at surface level.
The cover includes a factory-fitted rubber gasket designed to help reduce unwanted odours when the unit is fitted correctly.
Understanding the load rating
The T1G3 has a 5-tonne gross plated weight rating.
This does not mean that the cover can accept a concentrated five-tonne load directly on one point. Gross plated weight relates to the total vehicle rating and the test conditions specified by the manufacturer.
Suitability will also depend on:
- The supporting structure
- Installation quality
- Traffic type
- Wheel loads
- Vehicle speed
- Surface construction
- Intended location
Confirm the current manufacturer guidance before using the cover in an area exposed to vehicles or unusual loading.
Installation guidance
The cover and frame should be installed onto a stable and properly prepared supporting structure.
Before installation:
- Measure the inspection-chamber opening.
- Confirm that the circular opening is within the stated size range.
- Check the finished paving or floor level.
- Confirm that the intended surface build-up fits within the tray.
- Make sure the frame will be fully and evenly supported.
- Check that the cover can be removed after the surrounding surface is completed.
- Protect the gasket and lifting points during installation.
The frame should be installed level with the surrounding finished surface. It must not be left unsupported or allowed to bridge across an unsuitable opening.
The tray infill should be securely installed while keeping the lifting points clear and accessible.
Always follow the current Clark-Drain installation and loading guidance.
Using the cover with porcelain paving
The recessed design can help conceal an inspection chamber within a porcelain-paved area.
Before installing porcelain inside the tray, check the combined thickness of:
- The porcelain slab
- Adhesive or bedding material
- Any supporting infill
- The available tray depth
The paving may need to be cut accurately to fit the tray while leaving the lifting points accessible.
A suitable cutting blade and installation system should be used. The completed cover must still open freely without damaging the surrounding paving.
Access and maintenance
The inspection chamber must remain accessible after the surrounding surface has been completed.
Do not permanently grout, seal or pave over the joint between the removable cover and its frame.
Keep the lifting points free from grout, adhesive, concrete and debris. After installation, test that the cover can be lifted and replaced correctly.
The gasket and contact surfaces should be kept clean to help maintain a secure fit.
Frequently asked questions
Is the clear opening 440×440mm?
No. The 440×440mm measurement refers to the approximate overall size of the frame.
The cover is designed for a circular opening measuring approximately 220–300mm.
How deep is the recessed tray?
The internal tray depth is approximately 43.5mm. The overall frame depth is approximately 52mm.
Can the tray be filled with porcelain paving?
Porcelain may be used where the complete slab and bedding build-up fits within the tray and the installation is suitable.
The lifting points must remain accessible, and the completed cover must still be removable.
Does the cover prevent drainage smells?
The cover has a factory-fitted rubber sealing gasket designed to help reduce unwanted odours. Correct installation and keeping the sealing surfaces clean are also important.
Is it suitable for a driveway?
The product has a 5-tonne gross plated weight rating, but suitability depends on the supporting structure, installation and expected vehicle loading.
Confirm the current manufacturer guidance before installing it in a trafficked area.
What shape is the opening underneath?
The visible surface and external frame are square. The underside is designed to accommodate a circular inspection-chamber opening of approximately 220–300mm.
Are lifting keys included?
Yes. The cover includes integral lifting points for removing the recessed tray.
What is the product code?
The manufacturer’s model reference is T1G3. Your current Stone & Porcelain SKU is 00531.
How do I know whether it will fit?
Measure the clear opening beneath the current cover rather than measuring only the existing lid.
You should also check the available external space, finished surface level and required tray depth before ordering.
Additional Information
| Manufacturer | Clark-Drain |
|---|---|
| Model | T1G3 |
| Product type | Shallow recessed manhole cover and frame |
| Overall dimensions | 440 × 440 × 52mm |
| Internal tray dimensions | Approximately 420 × 420 × 43.5mm |
| Clear opening | Circular opening approximately 220–300mm |
| Material | Galvanised steel cover with polypropylene frame |
| Load rating | 5-tonne gross plated weight |
| Seal | Factory-fitted rubber sealing gasket |
| Lifting system | Integral lifting points/keys |
