Ductile cast iron socket fittings with TYTON®-sockets ( flangeless ) for use in potable water pipelines are designed for working pressures as given in EN 545 Annex and EN 545 Table for wallthickness class K9. Ductile cast iron fittings with screw-gland or bolted-gland sockets for use in potable water pipelines are designed for working pressures up to 16 bar. Higher pressures on request. Ductile cast iron fittings with one flange or more, for the use in potable water pipelines are designed for working pressures as given in EN 545 Annex and EN 545 Table . The working pressure has to be mentioned in.