Underground Triple Socket Tee 90Deg (110Mm)

Underground Triple Socket Tee 90Deg (110Mm)

The 110mm Underground Triple Socket 90 Tee (also known as a T-Branch) is a robust drainage fitting used to connect a branch line into a main underground sewer run. This specific model features three female sockets, each equipped with a pre-installed rubber captive seal.

Designed for gravity-fed drainage and sewerage, the triple-socket configuration allows for maximum flexibility during installation, as it can accept plain-ended pipes from three different directions. The terracotta orange color is the industry standard for identifying non-pressure underground drainage systems, ensuring they are not confused with internal soil or rainwater pipes.

Key Features and Specifications

Size: 110mm (Standard diameter for UK domestic underground drainage).

Angle: 90 (Actual angle is typically 87.5 to provide a natural fall for flow).

Configuration: Triple Socket (All three ends accept 110mm pipe).

Material: High-impact PVC-u, designed to withstand ground loading and earth movement.

Color: Terracotta Orange (Standard underground coding).

Joint Type: Push-fit with captive ring seals for a watertight, flexible joint.

Compliance: Manufactured to BS EN 1401-1 standards for underground sewerage.

Common Applications

Branch Connections: Joining a 110mm waste line from a house (kitchen or bathroom) into the main underground run.

Inlet Points: Connecting gully traps or surface water drains into the primary sewer network.

Inspection Chambers: Used in conjunction with shallow access chambers to manage multi-directional flow.

New Builds: Creating the primary underground drainage "carcase" for domestic properties.

Installation Guidelines

Lubrication: Always apply a silicone-based pipe lubricant to the rubber seals and the chamfered end of the pipe to ensure a smooth, leak-free connection.

Pipe Preparation: Ensure all pipes are cut square and deburred. A 15-degree chamfer should be filed onto the pipe end to prevent the rubber seal from being dislodged during insertion.

Expansion Gap: When pushing the pipe into the socket, pull it back by roughly 10mm to allow for thermal expansion and ground movement.

Bedding: The fitting should be laid on a suitable granular bed (such as pea shingle) to provide even support and prevent localized stress points.

Essential Companion Products

Lubricant: Silicone Pipe Lubricant (Spray or Tub).

Pipework: 110mm Underground Drainage Pipe (Terracotta Orange).

Bends: 110mm Underground Bends (15, 30, 45, or 90).

Access: 110mm Underground Rodding Eyes or Bottlegulleys.

Tooling: Fine-toothed saw and a pipe chamfering tool or rasp.

Specialist Support and Local Collection

Underground drainage requires reliable, high-quality fittings to ensure long-term performance under the weight of the soil. We stock a full range of 110mm terracotta fittings, including tees, bends, couplers, and adaptors.

Visit our trade counter at 61 Fullers Road, E18 2QB for immediate collection. Our team can help you identify all the components needed for a building-regulations-compliant drainage layout.