... etc. Throughout many years growth-up, many kings of products have been made such as double flanged series, push-on socket pipe fittings ... and ISO2531; and all types of Ductile Iron manhole covers have been developed in accordance with the Standard of EN124 and CJ ... of couplings and flanged adaptors. Well, at present our products have been exported into USA,South America, Europe, Middle East, Africa and ...