Hellermanntyton non metallic conduit hg hi range pa12 hellermann tyton 166 11503 the hellermanntyton helaguard 166 11503 hg hi21 is a corrugated non metallic conduit from the hg hi range this standard weight conduit has been manufactured from polyamide 12 pa12 and is highly resistant to oils and solvents it has a high fatigue life making it ideal for applications in robots rail machine building plant construction and wherever continual movement and bending are requirements hellerma