Universal Coupling Ductile Iron GGG50,GJS500-7,GGG40 Size: DN40-DN600 Pressure: PN10;PN16; 230psi. Pressure Test: PN15,PN24,350psi. EPDM, NBR Rubber Seals to EN681 & ASTM D2000. Painting: RAL5017 FBE coated, Min., Coating Thickness 200micron. Connected Pipe: DI Pipe, PVC/UPVC Pipe, Steel Pipe and Part AC Pipe. You can refer to http://www.hiwaflow.com for ***ail specifications.