The ductile iron grooved flange is the special connector used for connection between the pipe and flange, there are 1.6Mpa and 2.5Mpa (PN16 and PN25).

The ductile iron flange adaptor is the special connector used for connection between the pipe and flange, there are 1.6Mpa and 2.5Mpa (PN16 and PN25).