DMS1D4/45D/KT

Tristar D400 hinged circular manhole cover 450mm diameter clear opening with 100mm frame depth

Specification Knowledge base

Stock code	Range	Overall frame (mm)	Clear opening (mm)	Frame depth (mm)	Options	My Wrekin
DMS1D4/45D/KT	Tristar	Ø 620	Ø 450	100	Options Screw locking Standard badging Pressure release holes Flood and odour control plate	Quantity	Download

Features

The enlarged frame corners help to dissipate loads onto the foundation, providing a longer service life and increased reliability.
The enlarged frame corners help to dissipate loads onto the foundation, providing a longer service life and increased reliability.
Indexed corners ensure correct orientation first time, every time.
Indexed corners ensure correct orientation first time, every time.
Safety keyway prevents accidental disengagement of the lifting key during the handling process.
Safety keyway prevents accidental disengagement of the lifting key during the handling process.
Safety-stop hinges prevent covers from falling once opened.
Safety-stop hinges prevent covers from falling once opened.
Spring bar low security locking feature.
Spring bar low security locking feature.
70+ PSRV tested at top surface of chequer by UKAS accredited 3rd party.
70+ PSRV tested at top surface of chequer by UKAS accredited 3rd party.

Images

Specification

General information

Stock code	DMS1D4/45D/KT
Primary material	Ductile iron
Range	Tristar
Category	Manhole cover
Flanges	4

Standards, classes and groupings

Standards	BS EN 124-2
BS EN 124 Class	D400
BS EN 124 Group	4
Third party certified	Kitemark

Dimensions

Frame shape	Circular
Manhole shape	Circular
Overall frame (A x B)	Ø 620 mm
Clear opening (C x D)	Ø 450 mm
Frame depth (E)	100mm
Base opening (F x G)	Ø 500 mm

Available options

Screw locking

Screw locking deters unauthorised access to the chamber. An extended shank socket set is required to engage the locking screw.
Screw locking

Screw locking deters unauthorised access to the chamber. An extended shank socket set is required to engage the locking screw.
Industry standard badging

Integral industry-standard badging e.g. SW (Storm Water) and FW (Foul Water). Details are taken at point of order.
Industry standard badging

Integral industry-standard badging e.g. SW (Storm Water) and FW (Foul Water). Details are taken at point of order.
Pressure release holes

Pressure release holes provide additional airflow, with sizes permitted up to the maximum allowances specified in BS EN 124.
Pressure release holes

Pressure release holes provide additional airflow, with sizes permitted up to the maximum allowances specified in BS EN 124.
Flood and odour control plate

The flood and odour control plate is manufactured from steel and provides resistance to flood-water ingress and the chamber-odour egress.
Flood and odour control plate

The flood and odour control plate is manufactured from steel and provides resistance to flood-water ingress and the chamber-odour egress.

Accessories

Stock code	Description		My Wrekin
PC/UNIFORM/151076	Uniform chamber adjustment unit 760mm x 100mm x 15mm	Quantity	Download
PC/UNIFORM/251076	Uniform chamber adjustment unit 760mm x 100mm x 25mm	Quantity	Download
PC/UNIWEDGE/755012	Uniform support wedge 120mm x 50mm x 75mm	Quantity	Download
YPCR/U12.5	12.5Kg Unipak® rapid curing polyester resin mortar	Quantity	Download
YPCR/U25	25Kg Unipak® rapid curing polyester resin mortar	Quantity	Download
GRITBLOCKER	Anti-blockage keyway insert	Quantity	Download
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.	Quantity	Download
KEY/LONG	Large cover lifting keys with a long handle (sold as a pair)	Quantity	Download
KEYS/L	Small cover combined lifting key	Quantity	Download
DREDRING/45/35	Reducer ring with a 350mm inner diameter and 460mm outer diameter	Quantity	Download

Downloads

BIM model - DMS1D4-45D-KT - 178.ifc

BIM File-Login required

Wrekin Manhole Cover Installation Guide.pdf

Instruction manual-pdf

Kitemark Certificate.pdf

Certificate-pdf

PSRV Certificate of Conformance - 2025.pdf

Certificate-pdf

Notes

The use of Armadillo is recommended where exposure to construction site traffic is likely All values stated are nominal within 2.5% tolerance.

Knowledge base

Knowledge Base / Product and specification guidance

PSRV anti-slip and anti-skid resistance

Understand the difference between anti-slip and anti-skid, how the results are measured and the standards behind it.

Knowledge Base / Frequently Asked Questions

Ductile iron access cover FAQs

Frequently asked question questions about our ductile iron access cover range of products.

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.

Knowledge Base / Product and specification guidance

Surface oxidation on iron castings

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

Knowledge Base / Standards and conformity

Operation and maintenance of BS EN 124 ironwork

The complete operation and maintenance (O&M) manual for all Wrekin BS EN 124 ironwork.

Knowledge Base / Standards and conformity

National Highways skid resistance requirements

CD 534 v0.1.0 contains changes to skid resistance test requirements that are now based on a WRc test method for BS EN 124-conforming coarse textured cover surfaces. This article guides you through the test and Wrekin's conformance.

Knowledge Base / Standards and conformity

A guide to National Highways CD 534 V0.1.0

Released in May 2022 CD 534 v0.1.0 contains a number of key changes over it's predecessor. This article will guide you through the key changes and updates in National Highways CD 534 v0.1.0.

Knowledge Base / Product and specification guidance

Are all D400 manhole covers appropriate for highway use?

This helpful guide can help you to ensure that the D400 manhole covers you choose are suitable for highway use.

Knowledge Base / Standards and conformity

Understanding BS EN 124 groups and classes

BS EN 124:2015 divides access covers and gully grates into classes by static test load. It also categorises the various places where they may be installed from Group 1 to Group 6. This article will guide you through the groups and classes.

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.

Knowledge Base / Installation guides

Access cover installation guide

Installation guide for ductile iron BS EN 124 access covers.

Knowledge Base / Product and specification guidance

How manhole covers and gully grates are measured

Learn how to accurately measure manhole covers and gully grates with our helpful guide.

Knowledge Base / Installation guides

Manhole cover frame installation do's and don'ts

Read our do's and don'ts for when installing a manhole cover frame

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.

Knowledge Base / Installation guides

Manhole cover with flowable mortar installation guide

Installation guide for ductile iron BS EN 124 access covers when using a flowable mortar.

Knowledge Base / Installation guides

Screw locking instructions for Wrekin D400 & E600 manhole covers

The same method can be used to lock all Wrekin Tristar, Highway and Unite D400 and E600 manhole covers.

Knowledge Base / Product and specification guidance

On-site coating of ductile cast iron parts

Where the loss of barrier coatings has occurred, usually through trafficking and/or light corrosion, a site-applied paint coating may be successfully brush-applied to refresh the surface finish of ductile iron parts.

Knowledge Base / Product and specification guidance

Ductile iron product symbols

Guidance on the symbols and iconography displayed on Wrekin ductile ironwork.

Knowledge Base / Product and specification guidance

Lifting arrangements

Our manhole covers provide multiple safe lifting provisions.

Knowledge Base / Standards and conformity

A guide to conformity marking and voluntary third-party certification

Helpful information that guides you through applicable conformity marking and voluntary third-party certification requirements in the UK.

Knowledge Base / Frequently Asked Questions

Why do seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications?

Understand why seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications?

Knowledge Base / Standards and conformity

Specifying Products under BS EN 124

The BS EN 124 standard serves as a general guide for determining the stability of products, and it outlines the parameters for different classes of products in terms of static load tests. However, it doesn't offer much specific information about the dynamic loads that various traffic conditions on modern road systems can impose.

Knowledge Base / Product and specification guidance

D400 & E600 manhole cover locking options

Recognising the importance of controlled access in maintaining the integrity and safety of civil engineering projects, we offer advanced locking options for our D400 & E600 manhole cover ranges.

DMS1D4/45D/KT

Features

Images

Specification

General information

Standards, classes and groupings

Dimensions

Available options

Accessories

Downloads

Notes

Knowledge base

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