Rubber expansion joint Tapped DN10-DN80 Flange DN25-DN3200 Connection Threaded Flange Stainless steel flange material Ductile Iron DIN PN2.5 / PN6 / PN10 / PN16 / PN25 ANSI b16.5 CL150 / CL300 b16.47 CL150 AWWA C207 JIS 5K / 10K / 16K Rubber EPDM NR NBR CR Viton Structure: single ball (single sphere)/ double ball (double sphere) Groove button / fully sealed rubber flange type Overall vulcanized rubber expansion joints