... iron sheet etc. 3.Standard:ISO9001:2000,TS16949,SGS corrugate pipe 1. diameter:40-110mm 2. material: plastic(PE, PVC), galvanized ... prestress engineering. 4. round and flat tubeWe have our own corrugated pipe production base, our annual output is more than 2,000 ... contact us!Contact person:Ms.TiffanySkype:tiffany8907281Tel:+86-13512802538 Corrugate pipe