Brett Martin 300mmx225mm 90 Degree Twinwall Branch

• Manufacturer: Brett Martin

• Product Code: 3TT290 – describes a 300 mm main diameter with a 225 mm branch at 90°.

• Type: Triple‐Socket Branch, 90° angle (right‐angle) within a Twinwall (HDPE) underground drainage system.

• Sizes: Main run nominal diameter 300 mm; branch nominal diameter 225 mm. (300 mm × 225 mm)

• Material: High Density Polyethylene (HDPE) Twinwall pipe/fitting system (corrugated outer wall / smooth bore inner wall) for surface water drainage.

• Compatibility: Designed to work with BBA-approved Twinwall pipe systems (150 mm, 225 mm, 300 mm) under the same approval certificate (10/H168)

• Unequal branch sizes: The main pipe is 300 mm but the branch is 225 mm—this allows a right‐angle off the main trunk with a slightly smaller branch, useful for drainage networks that change diameter.

• 90° branch angle: Allows a direct perpendicular connection of the branch pipe, useful for layout changes or connecting across paths rather than at shallow angles.

• Triple socket design: All three connections have sockets – one for the main run in, one for the main run out, and one for the branch – simplifying assembly.

• Smooth bore inner wall: The Twinwall design used by Brett Martin includes a smooth inner wall for hydraulic efficiency, and corrugated outer for strength.

  Lightweight and easy handling: Twinwall HDPE systems weigh far less than analogous concrete systems, making them easier to install. (Mentioned generically in the surface‐water Twinwall brochure)

• Watertight installation capability: When fitted with the correct ring seals in each socket, the system can be installed to provide a sealed carrier drainage network.

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