The direct buried anti-corrosion polyurethane insulation pipe, the seller of polyurethane direct buried insulation pipe, has the good characteristics of * * heat preservation, waterproof, anti-corrosion, thermal insulation, sound insulation, flame retardant, cold resistant, anti-corrosion, light capacity, high strength, simple and fast construction, and fear of plant root thorns, and has become a building, transportation, petroleum, chemical, power