"Prospect " brand , twin wall concrete pump pipe system , Easy reach to 50000 to 80000 stere concrete . concrete pump pipes of twin-wall boom or deck pipes DN125, 4.5mm or 7mm thick, 3000mm with CCI big mouth weld-on collars, 80,000 cubic meters pumping capacity it pumps. we are the largest manufacturer and supplier of twin wall pipes in china. the most competitive price can be supplied by us. ...