R20B is a precast concrete rectangular headwall range for managing pipe outfalls in drainage and sewers. Single-piece concrete headwalls with separate toe extensions, accommodate single or multiple pipe openings up to 750mm in diameter. Factory-fitted accessories and customisable pipe invert levels are available.

  • Precast concrete headwall system for pipe outfalls

  • Backwall height of 1300mm and openings for pipes up to 750mm diameter

  • Single or multiple pipe openings

  • Openings cast to suit specified pipe diameter, material, and invert level

  • Three toe extension depths in 300mm or 500mm thickness

  • Wingwall options include sloped or horizontal designs

  • Factory-fitted options for gratings, flap valves, penstocks, handrails, baffle blocks, and orifice plates

  • Compliant with Sewers for Adoption guidelines for Section 104 Agreements

Applications

  • Surface water and foul water outfalls

  • Adoptable sewer schemes under Section 104 Agreements

  • Drainage systems for infrastructure and utilities

  • Water management in flood-prone areas

  • Pipework discharges into watercourses or ditches

  • Projects requiring factory-fitted safety and flow control accessories

Dimensions

  • Backwall height: 1300mm

  • Maximum pipe size: 750mm

  • Toe extension thickness: 300mm or 500mm

Materials

Made from precast concrete

Options and variations

  • Single or multiple pipe openings

  • For uPVC, clay, twin wall, or concrete pipes

  • Various wingwall slopes and horizontal options

  • Factory-fitted gratings, flap valves, penstocks, handrails, baffle blocks, orifice plates

Installation

Toe extensions fixed using threaded rod, nuts, washers, and high strength non-shrink grout

Accreditations

Compliant with Sewers for Adoption guidelines