Plastic‑coated steel pipes are internally and externally coated with hot‑dipped PE (modified polyethylene) or EP (epoxy resin), delivering excellent corrosion resistance. The coating also features good electrical insulation to avoid galvanic corrosion. It has low water absorption, high mechanical strength and low friction coefficient for long‑term service life. It can effectively resist damage from plant roots and soil environmental stress. Besides, it enables easy connection and convenient maintenance.