Brett Martin 45° Junction Twinwall Branch with Seals

This is a 45° junction (also sometimes called a “Y-junction”) designed for use in underground drainage / surface-water management systems. It is a twinwall-style junction, meaning it’s designed to connect with twinwall drainage pipe (corrugated or twin-walled pipe) rather than traditional solid-wall sewer pipe. It comes with integral or supplied seals (rubber sealing rings), so that pipes inserted into its sockets form a watertight connection without needing additional sealing components.

Typical Dimensions & Use

• Often used with twinwall drainage pipe of nominal diameters like 150 mm, 225 mm, or 300 mm (for larger surface-water drainage).

• For smaller underground drainage (e.g. soil/underground waste), the manufacturer also offers 110 mm and 160 mm pipe/fittings — though note that not all twinwall junctions may support 110 mm; some “twinwall” references are for larger surface-water systems.

• The 45° angle makes this junction suitable for systems where a branch or change in direction at a shallow angle is required — such as combining drainage lines, diverting flow, or connecting lateral pipes into a main run while maintaining good flow characteristics.

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