Product Description ISO2531 DN800 DCI ductile cast iron flange adaptors and couplings for ductile iron pipe   Product Description APPLICATIONUniversal flange adaptor is also called wide range flange adaptor, tolerance range flange adaptor .  It can fit most standard pipe materials and therefore dramatically reduces the stocks of dedicated couplings. It is suitable for steel , … Continue reading China factory ISO2531 DN800 Ductile Cast Iron Flange Adaptors and Couplings for Ductile Iron Pipe flange coupling