Hellermanntyton fittings for metallic conduit with plastic coating psc fm series hellermann tyton 166 31011 the hellermanntyton 166 31011 pcs12 is a conduit fitting with a pg9 fixed external thread for plastic coated metallic conduit from the pcs fm series the conduit fitting comprises of two parts the shell and the body the connector has been manufactured from nickel plated brass hellermanntyton 166 31011 pcs12 fm pg9 helaguard metallic conduit screw fitting