square to round manhole cover | Speedy Plastics https://www.speedy-plastics.co.uk Underground Drainage Soil & Waste Water Pipes & Fittings Distributor Sat, 10 Oct 2026 17:55:48 +0000 en-GB hourly 1 https://wordpress.org/?v=7.1.3 https://www.speedy-plastics.co.uk/wp-content/uploads/2018/03/cropped-logo-32x32.jpg square to round manhole cover | Speedy Plastics https://www.speedy-plastics.co.uk 32 32 159587051 Clark-Drain CD300SR 300 x 300 x 80mm Recessed Block Pavior Manhole Cover 35kN https://www.speedy-plastics.co.uk/shop/underground-drainage/inspection-chambers/110mm-x-320mm-manholes-western-depot/clark-drain-cd300sr-300x300x80-recessed-block-pavior-3-5ton/?utm_source=rss&utm_medium=rss&utm_campaign=clark-drain-cd300sr-300x300x80-recessed-block-pavior-3-5ton&utm_source=rss&utm_medium=rss&utm_campaign=clark-drain-cd300sr-300x300x80-recessed-block-pavior-3-5ton Wed, 29 Aug 2018 18:59:23 +0000 https://www.speedy-plastics.co.uk/shop/uncategorized/clark-drain-cd300sr-300x300x80-recessed-block-pavior-3-5ton/ The 300mm recessed manhole cover is a genuine Clark-Drain CD300SR polypropylene cover and frame for shallow inspection chambers.

This block paving manhole cover is a manufacturer-rated 35kN driveway manhole cover with a square to round chamber cover design, 80mm recessed tray and integral lifting keys. Continue reading →

The post Clark-Drain CD300SR 300 x 300 x 80mm Recessed Block Pavior Manhole Cover 35kN first appeared on Speedy Plastics.]]> 300mm recessed manhole cover from Clark-Drain CD300SR is designed to provide discreet access to shallow underground inspection chambers in paved areas. This block paving manhole cover features a recessed tray that allows paving to continue across the cover, helping it blend neatly into the surrounding finished surface. Manufacturer rated as a 35kN driveway manhole cover, the CD300SR is suitable for domestic driveway applications when correctly installed. Its square to round chamber cover design combines a square outer frame with a connection suitable for compatible circular inspection chamber risers.

300mm Recessed Manhole Cover

The 300mm recessed manhole cover is part of Clark-Drain’s polypropylene 300 Series inspection chamber range. The cover is designed for installations where access to the drainage chamber needs to remain available without interrupting the appearance of surrounding block paving or slabs. Clark-Drain specifies the CD300SR with an overall frame size of approximately 438mm x 438mm and an internal tray depth of 80mm. Manufacturer technical data identifies the stepped connection arrangement as suitable for chamber openings in the 220mm to 300mm diameter range. The recessed tray can accommodate block paving up to 60mm deep, allowing the paving pattern to continue across the inspection chamber cover rather than finishing around a visible conventional lid.

Clark-Drain CD300SR

Clark-Drain CD300SR is the genuine manufacturer reference for this recessed polypropylene cover and frame. Clark-Drain manufactures the cover as part of its 300 Series shallow inspection chamber system for 110mm underground drainage layouts. The manufacturer states that all 300 Series covers, risers and bases are manufactured from 100% recycled polypropylene. This gives the CD300SR a corrosion-resistant construction suitable for below-ground drainage access applications. The Clark-Drain CD300SR also incorporates integral lifting keys, allowing the recessed cover to be removed when access to the chamber is required for inspection, maintenance or rodding.

Block Paving Manhole Cover

A block paving manhole cover is useful where a conventional solid-top manhole cover would interrupt a paved driveway, patio or landscaped area. The recessed design allows suitable paving blocks or slabs to be positioned within the tray, creating a more discreet finish. Clark-Drain states that the cover can be rotated to align with the direction of the surrounding paving pattern. This helps installers maintain straight paving lines around the chamber and reduces the need to cut blocks around a circular inspection opening. The block paving manhole cover is designed to accommodate paving up to 60mm deep and should be installed with suitable support in accordance with the manufacturer’s guidance and the requirements of the finished surface.

35kN Driveway Manhole Cover

The CD300SR is manufacturer classified as a 35kN driveway manhole cover. Clark-Drain specifically identifies the 35kN loading as suitable for domestic driveway applications. The 35kN driveway manhole cover should only be used where the expected loading falls within the manufacturer’s stated limits. Commercial traffic, highways or applications involving heavier vehicles require a cover with an appropriate higher loading classification. Clark-Drain’s 300 Series literature confirms that the CD300SR cover has been designed as the driveway-rated recessed option within its shallow inspection chamber range.

Square to Round Chamber Cover

The square to round chamber cover design provides a square finished frame at surface level while connecting to compatible circular inspection chamber risers underneath. This arrangement is especially useful in block-paved areas because the square external shape allows paving to run neatly up to the cover frame while retaining compatibility with the circular chamber below. Clark-Drain’s technical information states that the stepped spigot/reducer design is intended for its compatible 300 Series chamber risers and can also accommodate many other chamber risers in the 220mm to 300mm diameter range. Compatibility should always be checked before fitting to a non-Clark-Drain chamber.

CD300SR Dimensions and Construction

Clark-Drain provides the following manufacturer specifications for the CD300SR:
  • Product reference: CD300SR
  • Nominal chamber opening: up to 300mm diameter
  • Compatible opening range: approximately 220mm to 300mm diameter
  • Overall frame dimensions: 438mm x 438mm
  • Internal recessed tray depth: 80mm
  • Frame depth: approximately 93mm
  • Manufacturer technical weight: 6.0kg
  • Load classification: 35kN
  • Application: domestic driveways and paved areas
  • Maximum paving depth: 60mm
  • Material: polypropylene
  • Integral lifting keys

Part of the Clark-Drain 300 Series

The 300mm recessed manhole cover is designed as part of Clark-Drain’s shallow polypropylene inspection chamber system for 110mm drainage layouts. Clark-Drain’s 300 Series includes chamber bases, risers and alternative cover options for different finished surfaces and load requirements. The manufacturer states that the 300 Series can be used for shallow drainage installations with maximum invert depths up to 600mm, depending on the selected chamber components. Clark-Drain’s 300 Series literature references BS EN 13598-1:2010, Sewers for Adoption Type 4 and Building Regulations Part H for shallow installations.

300mm Recessed Manhole Cover Key Features

  • Genuine Clark-Drain CD300SR product
  • Recessed cover and frame
  • 35kN manufacturer load classification
  • Suitable for domestic driveway applications
  • Designed for block paving up to 60mm deep
  • Square-to-round frame configuration
  • 438mm x 438mm overall frame size
  • 80mm recessed tray depth
  • Integral lifting keys
  • Cover can be rotated to match the paving direction
  • 100% recycled polypropylene construction
  • Corrosion resistant

Shop Recessed Manhole Covers

Browse our Block Pavior Manhole Covers & Frame category for alternative recessed manhole cover sizes and load ratings. The CD300SR is also listed within our compatible 320mm shallow inspection chamber range. For detailed manufacturer information, see the Clark-Drain 300 Series Inspection Chamber technical literature. The 300mm recessed manhole cover provides a genuine Clark-Drain CD300SR solution where a discreet block paving manhole cover, domestic 35kN driveway manhole cover and compatible square to round chamber cover are required.The post Clark-Drain CD300SR 300 x 300 x 80mm Recessed Block Pavior Manhole Cover 35kN first appeared on Speedy Plastics.]]> 4231