UnEqual Junction Underground Drainage Pipe

Drainage Unequal Junction Double Socket links a smaller branch pipe into a larger main run while maintaining efficient underground water flow. Its uPVC construction provides long-term resistance to ground chemicals, moisture, and constant burial loads, making it reliable for foul and surface water networks.

This fitting connects mixed pipe diameters and supports either a 45° shallow branch for smooth directional changes or an 87.5° near-vertical entry for sharper transitions and vertical-to-horizontal drops. Both angles help maintain hydraulic performance, depending on the layout, and reduce turbulence across underground drainage systems.

Double push-fit sockets allow direct connection of plain-ended pipes without couplers, supporting fast, secure installation on granular bedding. The fitting integrates with inspection chambers, manholes, gullies, and wider drainage runs across domestic and commercial projects.

Installation Guide:

• Cut and chamfer pipe ends before jointing to protect seals

• Push plain-ended pipes fully into the sockets until correctly seated

• Keep branch outlets aligned with natural flow direction to avoid backflow

• Support the fitting on compacted granular bedding

• Maintain correct drainage gradients for foul and surface water systems

• Surround with granular backfill before final soil reinstatement

Equal vs Unequal Junction - Which One Should Be Used?

Equal Junction (110mm → 110mm or 160mm → 160mm)

Equal junctions connect same-size drainage pipes. They are used when the branch line carries the same flow capacity as the main run. Ideal for standard drainage layouts, new-build networks, and balanced foul or surface water systems. They maintain consistent hydraulic performance because all ports share the same diameter.

Unequal Junction (160mm → 110mm or similar)

Unequal junctions connect different pipe diameters, allowing a smaller branch pipe to feed into a larger main system. They are used where flow volumes differ, where a secondary pipe needs upgrading, or where site conditions require size transition without reducers. They maintain system efficiency by supporting smooth flow entry at mixed-diameter interfaces.

Which One Should You Choose?

Choose Equal Junction when all connected runs use the same pipe size and you want consistent capacity.
Choose Unequal Junction when a 110mm line connects to a larger 160mm main run, or when integrating mixed-size drainage layouts without extra adaptors.