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Althon Limited

Althon Limited Contact Details

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01603 488598
Mr Tim Gates
MAG Group Building
Vulcan Road South
England UK

About Althon Limited

Althon Precast Headwalls and Water Management

Althon Ltd manufacture and distribute specialist water management products to the construction industry.

We design and manufacture precast concrete headwalls to meet Sewers for Adoption and Severn Trent Guidelines. Our product range includes flap valves, penstocks and stop logs as well as trash screens and outfall safety grilles. Althon also manufacture precast concrete penstock chambers and offer a large range of commercial and industrial application drainage channels.

Precast Concrete Headwalls

Althon precast concrete headwalls offer a cost effective alternative to in-situ headwalls pipework discharging into attenuation ponds, rivers, ditches, swales and tidal environments. We have ranges of Sewers for Adoption 7th Ed. and Severn Trent Water specification compliant headwalls. We offer a range of factory fitted accessories on our headwalls such as flap valves, penstocks, Kee Klamp® handrails, baffle blocks as well as gratings and trash screens.

  • Precast Concrete Headwalls
  • Headwall Specifier
  • Standard Precast Concrete Headwalls
  • Sewers for Adoption (SFA) Headwalls
  • Rectangular Precast Headwalls
  • Rectangular SFA Headwalls
  • Angled Precast Headwalls
  • Culvert Precast Headwalls

Flow Control & Flood Prevention

Althon offer a range of specialist water management and flood prevention products such as HDPE flap valves, ductile iron flap valves, penstocks, Wastop inline non-return valves, stop logs, Tideflex duckbill and Checkmate valves. We offer flanged, wall mounted and tidal flap valves as well as wall mounted and inline penstocks.

We can factory fit most of these products to our precast headwalls or precast inspection chambers if required.

  • Penstocks
  • Flap Valves
  • Wastop Inline Non Return Valves
  • Hand Stop Gate
  • Stoplogs
  • Manhole Pipe Safety Chains
  • Orifice Plates
  • Tideflex Valves

Drainage Channel Range

The Althon drainage channel range of surface water channel drainage products caters for all types of construction sites from car parks to airports and docks. Our drainage channels cater for applications from A15 – F900 load classes.

We have a range of heavy duty concrete drainage channels from 100 – 500mm wide, concrete slot drainage channels as well as polymer concrete drainage channel and galvanised or stainless steel slot drains and façade channels. We also manufacture a high capacity channel drainage system.

  • Heavy Duty Concrete Drainage Channel
  • Concrete Slot Drainage Channel
  • Steel Slot and Facade Drainage Channel
  • High Capacity Drainage Channel
  • Polymer Concrete Drainage Channel
  • GRP Lightweight Drainage Channel
  • Shallow Concrete Drainage Channel

SFA Outfall Safety Grilles, Trash Screens & Precast Penstock Chambers

Althon offer a comprehensive range of Sewers for Adoption, Sewers for Scotland and UU specification gratings, 45 and 60 degree sloped trash screens with the option for side returns and circular pipe mounted gratings.

We also have a range of precast concrete chambers for housing factory fitted penstocks and precast concrete end walls with fitted penstocks or flap valves.

  • Sewers For Adoption Outfall Safety Grilles
  • Sloped and Circular Trash Screens and Gratings
  • Precast Concrete Penstock Manhole Chambers
  • Precast Concrete Penstock Endwalls

Althon Ltd are part of the MAG Group of Companies

MAG Group Limited is a privately owned UK based business operating since 1982. MAG Group has 6 subsidiary companies concentrating on the manufacture and supply of specialist products for the construction industry and retail markets.

We employ around 70 people and have a customer base throughout the UK and worldwide having traded in over 50 countries to date. MAG Group Limited anticipates significant growth in 2018 with Group turnover set to exceed £17 million.

If you have any more questions or enquiries please Contact Us



Bespoke Headwall at Mauldslie WWTW

Althon have recently supplied a bespoke precast headwall retaining wall at Mauldslie WWTW.
The headwall was manufactured to accommodate multiple pipe openings and to site specific dimensions.
The headwall was offloaded and installed by the contractor within the space of a morning.
If you require a bespoke precast headwall please use our Headwall Design Tool or email us at for more information on how we can help.
Headwall Design Tool

Althon have launched a Headwall Design Tool to enable you to specify the headwall you require with associated factory fitted accessories.

We have produced a Headwall Design Request Form where you fill out as much information as possible. We will then send you a CAD & PDF drawing of your chosen headwall and will liaise with you to further refine the design to suit your specific requirements if required.

Headwall accessories include but are not limited to flap valves, penstocks, cascade panels, dissipation blocks, V notch weirs, handrails, gates & ladders.
Headwalls with Cascade Panels

We have recently manufactured a precast concrete headwall complete with a 8.5m long cascade panel for a project in Sunderland.

You can use our Headwall Specifier to find the headwall you require. We can then assist with pricing and design drawings detailing Cascade panesl on our headwall drawings in CAD and PDF

You can also visit the Precast Headwalls section of our website or call us on 01603 488700
Headwall BIM Objects

Althon have just launched BIM objects available to download from the Headwalls section of our website in .rfa .ifc and .adsk other file types available on request.

If you cannot find the drawing you require in 3D please email us

Visit The Althon Headwalls Website
Products & Services

SFA Headwalls

Standard Headwalls

Angled Headwalls

Precast Concrete Headwalls


Flap valves

SFA Gratings & Trash Screens

Concrete penstock chambers

Steel slot channel

Steel drainage channel

Concrete drainage channel

Inline non return valves

Tidal flap valves

Penstock chambers

Concrete chambers

Trash screens




Drainage channel

Althon Limited General Description

Althon specialise in the design, manufacture and distribution of drainage products for the management, treatment, isolation and control of water. Our range of products includes Althon precast concrete headwalls, HDPE, cast iron and stainless steel flap valves, penstocks and stop logs
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