Althon supply precast headwalls with factory fitted accessories.

The company have recently supplied a new AH4C left hand angled precast headwalls factory fitted with a 250mm HDPE flap valve and nine small diffuser blocks on the spillway.

All their precast headwalls can be fitted with diffuser blocks on the spillway, stepped baffle blocks or cascade panels.

The AH4C range of precast headwalls have been designed specifically to meet the Environment Agency’s Standard rules SR2015 No 27 – Constructing an outfall pipe of 300mm diameter through a headwall into a main river & Exempt flood risk activities: environmental permits section FRA12 ‘Outfall pipes less than 300mm diameter through a headwall.