SP21N precast headwalls are produced with a horizontal wing walls at the front of the apron. SP21N precast headwalls are for inlets or outlets situated in locations with high or steep embankments or where the structure is required to provide protection to an accessory such as a flap valve, duck bill valve, stop logs or weir wall. SP21N precast headwall has been designed to suit plastic or clay pipework up to 1500mm and concrete pipework up to 1500mm ID. It has a backwall height of 2400mm and a flat spillway. Althon SP21N precast concrete headwalls are cast in two pieces and to suit the diameter and type of pipe being used and can be provided with fixings cast in at the time of manufacture to accommodate gratings, trash screens, flap valves, ladders, guardrails and flow and depth monitoring equipment.

SP21 precast headwall units can be factory fitted with a range of accessories such as flap valves, penstocks, Kee Klamp® handrails and a selection of gratings depending on the application.

If you require any assistance or more information please contact us by phone on 01603 488700 or by email sales@althon.co.uk

SP21 N Headwall line drawing
As standard our headwalls have a natural concrete finish.
We can offer coloured headwalls in 4 colours but the final shade is affected by many influences.
Our Headwall Products are available in a range of colours
Natural
Our Headwall Products are available in a range of colours
Cotswold
Our Headwall Products are available in a range of colours
Agate
Our Headwall Products are available in a range of colours
Raven Grey
Our Headwall Products are available in a range of colours
Everglade
Product Name
Max Pipe Opening PCC
Max Pipe Opening Plastic / C'ware
Backwall Height
Approx Headwall Weight (kg)
Wingwall Profile
SP21 N Headwall
1500
1500
2400
9176
Horizontal

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    SP21 N Headwall + 1200mm Flap Valve + Halfway Kee Klamp

    SP21 N Headwall + 1200mm Flap Valve + Cranked Grating + Halfway Kee Klamp

    SP21 N Headwall + 1500mm Flap Valve

    SP21 N Headwall + 1500mm Flap Valve + Cranked Grating

    SP21 N Headwall + 1500mm Flap Valve + 3 Sided Kee Klamp

    SP21 N Headwall + 1500mm Flap Valve + Cranked Grating + 3 Sided Kee Klamp

    SP21 N Headwall + 1500mm Flap Valve + Backwall Kee Klamp

    SP21 N Headwall + 1500mm Flap Valve + Cranked Grating + Backwall Kee Klamp

    SP21 N Headwall + 1500mm Flap Valve + Halfway Kee Klamp

    SP21 N Headwall + 1500mm Flap Valve + Cranked Grating + Halfway Kee Klamp

    SP21 N Headwall + 150mm Penstock

    SP21 N Headwall + 150mm Penstock + Cranked Grating

    SP21 N Headwall + 150mm Penstock + 3 Sided Kee Klamp

    SP21 N Headwall + 150mm Penstock + Cranked Grating + 3 Sided Kee Klamp

    SP21 N Headwall + 150mm Penstock + Backwall Kee Klamp

    SP21 N Headwall + 150mm Penstock + Cranked Grating + Backwall Kee Klamp

    SP21 N Headwall + 150mm Penstock + Halfway Kee Klamp

    SP21 N Headwall + 150mm Penstock + Cranked Grating + Halfway Kee Klamp

    SP21 N Headwall + 250mm Penstock

    SP21 N Headwall + 250mm Penstock + Cranked Grating

    SP21 N Headwall + 250mm Penstock + 3 Sided Kee Klamp

    SP21 N Headwall + 250mm Penstock + Cranked Grating + 3 Sided Kee Klamp

    SP21 N Headwall + 250mm Penstock + Backwall Kee Klamp

    SP21 N Headwall + 250mm Penstock + Cranked Grating + Backwall Kee Klamp

    SP21 N Headwall + 250mm Penstock + Halfway Kee Klamp

     

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