Althon Ltd

01603 488700

About us

Althon Limited manufacture and distribute specialist water management products to the construction industry. We manufacture the largest range of precast concrete headwalls in the UK for pipes, culverts and box culverts. Precast headwalls are an important part of most SUDS drainage schemes, preventing erosion at the point of discharge into watercourses such as attenuation ponds, detention basins, rivers, ditches and swales.

Althon Limited is also part of MAG Group Limited which 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.

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 offer a range of factory fitted accessories on our headwalls such as GRP yellow Handrail, flap valves, penstocks, Kee Klamp®️ handrails, baffle blocks as well as gratings and trash screens.

Precast Concrete Headwalls

Althon have several ranges of headwalls which can accommodate pipework up to 2100mm. We can cast multiple pipe openings into our outfalls if required. We are able to cast in the opening for the connecting pipe or pipes anywhere on the backwall or in the wingwalls (sidewalls). Drainage pipes discharging into open watercourses should be fitted with a concrete headwalls. Althon’s standard concrete headwalls are fast and easy to install.

All Althon precast concrete headwalls can be factory fitted with accessories such as outfall safety grilles, Kee Klamp®️ handrails, flap valves and penstocks. We are also able to provide additional precast elements, such as diffuser blocks, stepped baffle blocks, extended spillways with cascade panels and in some instances precast steps. We are happy to help design a precast concrete outfall & spillway to your site specific requirements.

Althon have the largest range of precast headwalls with associated accessories available in the UK. If you cannot find the product you are looking for please get in touch with us and we will be happy to assist. We are constantly uploading new ranges and new drawings to our website, we are confident we will be able to meet your spillway and outfall requirements.