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DBT0D4/4428/KH

Highway D400 surface box 445mm x 280mm clear opening with 100mm frame depth

Specification Knowledge base

Stock code Range Clear opening
(mm)		 Overall frame
(mm)		 Frame depth
(mm)		 Options My Wrekin Downloads
DBT0D4/4428/KH Highway 445 x 280 680 x 515 100

Features

  • Enlarged corners spread loads evenly across the foundation, enhancing reliability and lifespan.

    Enlarged frame corners

  • Safety keyways prevent accidental lifting key disengagement during handling for safer operation.

    Safety keyway

  • Independently tested by a UKAS-accredited laboratory to achieve a PSRV value of 70+ on the chequer surface.

    PSRV tested

  • Built-in lifting points allow safe mechanical lifting, reducing manual handling and improving on-site safety.

    Mechanical lifting point

  • Non-rocking three-point suspension provides stable seating for silent, reliable operation.

    3 point suspension

  • Strengthened corners dissipate loading stresses effectively, providing long-term durability and preventing damage to the frame and cover.

    Gussets icon

  • Directs forces vertically to convert traffic loads into mortar-compatible compression forces.

    Cover support geometry

  • Indexed corners ensure correct orientation and alignment first time, every time.

    Indexed corners

  • Integrated keyway frame lifting points provide safe and secure handling.

    Keyway lifting point in the frame

  • Frame holes allow mortar to flow through the flange, creating a strong mechanical bond for added stability.

    Mortar Apertures icon

  • Lightweight design allows safe installation by a single person, reducing labour costs.

    Single person lift

  • Texturing above and below the flange improves mortar grip and reduces lateral movement and cracking.

    Textured mortar engagement flange surface

  • Meets the requirements of CD 534 v0.2.0.

    CD 534 v0.2.0 logo

Images

Specification

General information

Stock code
DBT0D4/4428/KH
Primary material
Ductile iron
Range
Highway
Category
Surface box
Flanges
4

Standards, classes and groupings

Standards
BS EN 124-2
BS750
BS5834
DMRB
MCHW
CD 534 v0.2.0
BS EN 124 Class
D400
BS EN 124 Group
4
Third party certified
Kitemark
BS 5834 Grade
A
BS 750 Grade
A

Dimensions

Frame shape
Rectangular
Manhole shape
Rectangular
Overall frame (A x B)

680 mm x 515 mm
Clear opening (C x D)

445 mm x 280 mm
Frame depth (E)
100mm
Base opening (F x G)

465 mm x 300 mm

EPD Data

Total life cycle (cradle to grave)
75.61 kg CO₂ equivalent
Download EPD Data
BRE Greenbook Live
BRE Verified Logo

Available options

Accessories

Stock code Description My Wrekin
PC/UNIFORM/151076 Uniform chamber adjustment unit 760mm x 100mm x 15mm
PC/UNIFORM/251076 Uniform chamber adjustment unit 760mm x 100mm x 25mm
PC/UNIWEDGE/755012 Uniform support wedge 120mm x 50mm x 75mm
YPCR/U6.5 6.5Kg Unipak® rapid curing polyester resin mortar
GRITBLOCKER Anti-blockage keyway insert
SCREWLIFT Simple and rapid manhole frame levelling system. Simply push the bushes into the holes in the flange and adjust the levelling screws to the required height.
KEY/LONG Large cover lifting keys with a long handle (sold as a pair)
KEYS/L Small cover combined lifting key

Downloads

BIM model - DBT0D4-4428-KH - 198.ifc
BIM File-Login required
Kitemark Certificate.pdf
Certificate-pdf
PSRV Certificate of Conformance - 2025.pdf
Certificate-pdf
Wrekin BRE Verified EPD Standard Range.pdf
Environmental Product Declaration (EPD)-Login required

Knowledge base

Access cover being installed

Knowledge Base / Standards and conformity

Sewers for adoption

Sewers for Adoption (7th edition) contains guidance for the design and construction of sewers that will be adopted by Sewerage Undertakers in England and Wales in accordance with Section 104 of the Water Industry Act 1991. This helpful guide will take you through what you need to know.
Access cover being installed

Knowledge Base / Product and specification guidance

What information is on product labels?

A handy guide showing the information on our product labels. This information will help you identify what products you have when picking, packing or installing on-site.
Road resurfacing

Knowledge Base / Product and specification guidance

ID badging and antenna options (RFID, NFC, IoT)

A large number of our Unite and Highway covers provide the facility for a retrofittable badge to be installed in the cover, without the need for welding. In addition, this location can also be used to install communications antennas within the cover, removing the need to adjust the surrounding road surface.

This article discusses the potential applications of this technology.
Access cover being installed

Knowledge Base / Product and specification guidance

Surface oxidation on ductile iron castings

Guidance on surface oxidation on iron castings, including what our covers are coated with and why we do this.
Access cover hero image

Knowledge Base / Product and specification guidance

Manhole cover range comparison chart

A comprehensive feature comparison of our market leading Tristar, Highway and Unite ranges of access cover.
  1. Wrekin Products Ltd is continually seeking to improve our products and therefore reserves the right to alter product specifications without prior notice.
  2. It is the responsibility of all users to satisfy themselves the above data is current.
  3. All values stated are nominal within 2.5% tolerance.
  4. Installation details are available in the knowledge base.
  5. All Wrekin products are supplied subject to our Terms and Conditions of Sale.
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