China Resin Concrete Channel Drainage with Heavey Duty Ductile Cast Iron Grating From Load Class C250kn (25 tonnes) to F900kn (90 tonnes), Find details about China Channel, Drainage from Resin Concrete Channel Drainage with Heavey Duty Ductile Cast Iron Grating From Load Class C250kn (25 tonnes) to F900kn (90 tonnes)