Coupling specifications Universal Coupling Price Details: Ductile Iron Universal Coupling According to ISO2531&EN545 Size Range: DN40-DN600 Pressure: PN10/16 Bolts and Nuts material:Carbon Steel Coating: Fusion Bonded Epoxy coating Use: This kind of couplings can be used for ductile iron or PVC pipes. Features Universal Coupling is for STEEL . DI , UPVC,PPR,CI AND AC pipes or almost any other rigid pipe material . In the form of wide range (up to 23mm) couplings , are designed to joint pipes of various outside diameters with the same of different nominal bore .ship by sea. Airline shipping is also optional.Coupling specifications website:http://www.tianyisunspipeline.com/coupling/