Hellermanntyton galvanised steel with pvc conduit htwd din series hellermann tyton 166 30705 the hellermanntyton 166 30705 is a galvanised steel wiring duct with pvc conduit from the htwd din range this wiring duct will efficiently route and protect wire and cable the dimensions of the htwd din wiring duct as well as the spacing of the punched holes in the base comply with en 50085 the fingers forming the slots can be removed at snap off points without forming sharp edges the wiring duct