Supplied together Cast-Iron Ring & Covers, bolts and rubber rings, we can ... design these flange adaptors and couplings according t Cast-Iron Ring & Covers: Dimension standard: ISO2531, 40-600mm, PN10/ ... resinThe stable quality and competitive price have gained us many customers all over the world such as WATTAS ... , MUELLER,US PIPE,Kurdizel, etc. and we were awarded as ...