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The Althon 150mm Swale Inlet Headwall is a swale and pond fibre reinforced precast concrete open inlet allowing surface water runoff to enter SUDS features, or to act as an outlet or overflow. This swale inlet is designed for pipework up to and including 150mm.

The profile of the inlet 1:3 (18 Degrees) is the same as the surrounding ground in accordance with guidelines for the construction and adoption of swales and ponds. There is a recess formed in either side to key the unit into the slope of the swale or pond and prevent it slipping.

Our 150mm swale inlet connects to pipework with a 150mm twinwall stub cast into the unit. The unit is fitted with a hinged 25mm grille which is available in mild steel galvanised after manufacture as standard or stainless steel to order. The grilles are fixed to the inlet with 4 No anti-tamper bolts, when the bottom two bolts are removed the grating hinges for ease of maintenance. The grating is located in an 8mm deep recess in the face of the unit to protect it from damage during routine maintenance of the surrounding area.

The 150mm Swale Inlet can be factory fitted with a 150mm inline non – return valve such as a Wastop if required

If you require any assistance or more information please contact us by phone on 01603 488700 or by email

Althon Swale Inlet Headwall-150 line drawing
Product Name
Max Pipe Opening PCC
Max Pipe Opening Plastic / C'ware
Backwall Height
Approx Headwall Weight (kg)
Althon Swale Inlet Headwall-150

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    Althon Swale Inlet Headwall-150 + Mesh Grating

    Althon Swale Inlet Headwall-150 + Mesh Grating + Wastop Ss150mm


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