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Backing rings
Material: Ductile iron, carbon steel, stainless steel
Coatings: Antirust paint, epoxy paint, hot dipped galvanized, fusion bounded epoxy resin, Dacromet coating
Flange drilling: ANSI 150# / DIN/EN PN10
Pressure: SDR7, SDR11
Size: 1" to 48"
Nodular cast iron ring with red epoxy paint:
http://www.flanges-fittings.com/backing-rings/