Brett Martin 87.5º Double Socket Branch 110mm

Key Features & Highlights

• Precision Engineering: Connects 110mm (4") underground pipework at an 87.5° angle to maintain continuous, efficient gravity flow.

• Captive Seal Technology: Features Brett Martin’s market-leading captive ring seals that prevent dislodgement during jointing for a dependable, leak-proof seal.

• Double Socket Design: Socketed ends accept 110mm plain-ended pipes directly, simplifying alignment and cutting down on installation time.

• Durable PVCu Construction: Tough, lightweight terracotta plastic that resists impact, soil chemicals, and ground movement.

• Fully Certified: Manufactured in the UK under ISO 9001 and compliant with BS EN 1401-1 standards for underground foul water and sewage management.

The Brett Martin B5101 110mm 87.5° Double Socket Branch is an essential underground drainage fitting designed to join two 110mm (4-inch) pipe runs at a near-right angle. Engineered for both domestic and commercial drainage layouts, this branch junction allows branch lines to feed cleanly into main drainage channels with minimal hydraulic resistance.

Made in the UK from high-strength PVCu, the B5101 junction is built to endure harsh underground conditions, ground stress, and chemical exposure from wastewater. Its double socket design allows plain-ended 110mm pipes to push straight into the receiving ends, while the remaining spigot end slots directly into standard 110mm fittings or sockets.

Equipped with Brett Martin’s signature captive rubber ring seal system, the fitting guarantees that seals stay firmly locked in place during pipe insertion. This prevents accidental seal displacement and ensures a permanent, watertight joint every time.

Technical Specifications

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