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What is an SP21 K headwall and when should it be used?
What is an SP21 K headwall and when should it be used?

The SP21 K headwall is a precast concrete unit with horizontal wingwalls (flat apron) designed for inlets/outlets in steep or high embankments or where flow-control devices like flap valves or stop logs are needed. It supports pipe diameters up to 1500 mm.

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