electrofusion tee is a specialized pipe fitting used to create a permanent, leak-proof 90° branch connection in thermoplastic piping systems, most commonly those using High-Density Polyethylene (HDPE). It contains embedded electrical resistance wires that, when energized by an electrofusion welding machine, melt the plastic of both the fitting and the pipe to fuse them into a single, monolithic joint.

• Equal Tee: Features three ports of the same diameter. It is used for balanced pipeline networks where uniform flow distribution is required across all branches.
• Reducing Tee: Has a smaller-diameter branch port compared to the main run. This allows for a seamless transition between different pipe sizes without needing extra reducer fittings, often used to supply service lines from a main distribution pipe.
• Tapping Tee (Saddle Type): A specialized fitting designed to create a branch on a live pipeline without interrupting the flow. It includes an integrated cutter to bore a hole into the main pipe after the saddle is fused. 

• Material: Typically made from PE100 or PE80 high-density polyethylene, which offers high strength and resistance to corrosion and chemicals.
• Size Range: Commonly available from 20mm to 630mm or larger, depending on the manufacturer.
• Pressure Rating: Often rated at PN10 (10 bar) or PN16 (16 bar) for water, with specific ratings for gas distribution according to standards like BS EN 1555.
• Temperature Tolerance: Designed to operate effectively between -40°C and +60°C, making them suitable for buried or shielded outdoor use.

• Water Distribution: Used in municipal networks for leak-free potable water and sewerage systems.
• Gas Pipelines: Preferred for natural gas distribution due to the safety of its high-integrity, monolithic joints.
• Industrial & Mining: Deployed for transporting chemicals, mineral slurries, and compressed air where corrosion resistance is essential.