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DBT0D4/4428/KT

Tristar 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)		 My Wrekin Downloads
DBT0D4/4428/KT Tristar 445 x 280 565 x 400 100

Features

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

    PSRV tested

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

    Safety keyway

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

    3 point suspension

  • Gussets dissipate loading stresses effectively, providing long-term durability by preventing damage to the frame and bedding material.

    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

  • 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

Images

Specification

General information

Stock code
DBT0D4/4428/KT
Primary material
Ductile iron
Range
Tristar
Category
Surface box
Flanges
4

Standards, classes and groupings

Standards
BS EN 124-2
BS5834
BS750
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)

565 mm x 400 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)
62.35 kg CO₂ equivalent
Download EPD Data
BRE Greenbook Live
BRE Verified Logo

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
KEYS/L Small cover combined lifting key
KEYS/LONG Large cover lifting keys with a long handle
  1. All information provided is subject to change without notice. While every effort is made to ensure accuracy and relevance, Wrekin Products Ltd. does not warrant the completeness or reliability of the information contained herein. Photographs, illustrations, and other visual materials are provided for illustrative purposes only.
  2. Wrekin Products Ltd. reserves the right to make design amendments or improvements to any product at any time, where such changes enhance performance or durability, without affecting compliance with the stated standards.
  3. Where errors or omissions are identified, amendments will be made as quickly as possible.
  4. It is the responsibility of all users to satisfy themselves the above data is current.
  5. All values stated are nominal within 2.5% tolerance.
  6. Installation details are available in the knowledge base.
  7. All Wrekin products are supplied subject to our terms and conditions of sale.
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