Hellermanntyton galvanised steel conduit sc series hellermann tyton 166 30103 the hellermanntyton 166 30103 sc20 is a helaguard galvanised steel conduit from the sc series this flexible steel conduit has a high compression strength and high tensile and impact strength applications include under floor wiring in offices data cabling protection of hydraulic or pneumatic conduits and high mechanical protection hellermanntyton 166 30103 sc20 galvanised steel conduit 169mm