Our company Shandong Hesper Rubber Plastic Co., Ltd. produces 6"-20" (160mm-400mm) PE plastic ventilation hoses and water hoses for tunnels and mines, also produces 4-20" (70mm-700mm) PE composite high Strength plastic film ventilation duct, flame retardant duct for shipyards, pig houses, aquaculture, factories etc. For example, 20mm-400mm high pressure polyethylene (PE) plastic hoses, civil plastic water hoses,20mm-400mm agricultural polyethylene irrigation and drought-resistant composite high-strength water conveying film hoses.