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Directly buried insulation spiral steel pipe
Polyurethane foam insulated spiral steel pipe
TPEP anti-corrosion spiral welded pipe
Thin walled spiral steel pipe
Large caliber submerged arc welded spiral pipe
Mining coated spiral welded pipe
Thick walled spiral welded steel pipe
Plastic coated spiral pipe for water supply and drainage
Spiral steel pipes coated with plastic inside and outside for water supply
Spiral steel pipes coated with plastic both inside and outside for electric power
Polyethylene insulated spiral steel pipe
8710 anti-corrosion spiral steel pipe for drinking water pipeline
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