300 x 300 Manhole Covers

One of our most popular sizes in our range is 300 x 300 manhole covers. With dimensions of 300mm x 300mm (11.8" x 11.8") and varying heights, find the perfect recessed drain cover for your needs below. Read more

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What size is a 300 x 300 recessed manhole cover?

Here at RMC we advertise our clear opening sizes in millimetres. For those not familiar with the metric system, our 300mm x 300mm covers are approximately 12 inch by 12 inch.

What do you refer to as the "clear opening"?

Manhole cover and their frames are determined by clear opening sizes, this is essentially the size of the chamber opening (brickwork to brickwork) which the cover is to span over – whether it’s a square or round opening.

 

How do I calculate that I need a cover 300mm x 300mm in size?

Measurements in millimetres will need to be taken from the inside walls of the chamber opening, from one side to the other. If the opening is rectangular or square then both the height and width measurements will be needed – as compared to only requiring the diameter of a circular opening. 

 

What are the different types of 300 x 300 recessed drain covers?

Our coverage of 300 x 300 manhole covers ranges across; Sealed & Locking, Block Paving, Grass & Gravel, Aluminium Double & Triple Sealed.

 

Where are 300 x 300 manhole covers typically installed?

For indoor use we typically specify a sealed lockable cover as this ensures a flush profile (as non-locked covers rely on being self-secured by the weight of the infill) with maximum utilisation of the seal.

For outdoor usage with traffic higher than pedestrian we recommend a deeper recess, to enable a higher volume of an infill layer to bolster its strength.

 

Explore the range at Recessed Manhole Covers

We offer a wide range of manhole covers that assist in many applications, not only recessed but solid top offerings across a variety of openings.

If we can be of any assistance to your current and upcoming project, whether commercial or domestic – contact us direct!