The H3G GRC headwall is a precast glass-reinforced cement headwall with an opening to suit 150mm diameter pipes and knockout webs to enlarge to 225mm and 300mm diameter pipes.

Stainless steel sockets are provided for the attachment of gratings. The dimensions of the unit are as the H3C (linked below) with a reduced toe depth of 150mm and nominal wall thickness of 20mm.

They offer a cost-effective alternative to in-situ structures for connecting drainage pipework discharging into open water courses.

Technical specification

  • Nominal wall thickness 20mm

  • Toe depth 150mm

  • Stainless steel sockets for attaching gratings

Althon can offer coloured headwalls in 4 colours

  • Natural

  • Cotswold

  • Agate

  • Raven Grey

  • Everglade

Dimensions and weight

  • Max Pipe Opening PCC - 360

  • Max Pipe Opening Plastic / C'ware - 360

  • Backwall Height - 700

  • Approx Headwall Weight (kg) - 150kg