HDPE (High-Density Polyethylene) electrofusion pipe fittings are used to connect and join HDPE pipes in various applications, including:

1. Water and gas distribution
2. Sewage and drainage systems
3. Industrial processing and chemical handling
4. Mining and oilfield applications

Electrofusion fittings offer:

1. High-strength joints
2. Corrosion resistance
3. Chemical resistance
4. Low maintenance
5. Easy installation

Types of electrofusion fittings:

1. Couplers
2. Elbows
3. Tees
4. Reducers
5. End caps

Manufacturers:

1. Georg Fischer (GF)
2. Uponor
3. Wavin
4. Friatec
5. Electrofusion Corporation

Standards and Regulations:

1. ASTM F1055 (Standard Specification for Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene Pipe)
2. ISO 4427 (Polyethylene pipes and fittings for water supply)
3. Local and national plumbing and building codes