Hellermanntyton conduit y connector and reducer hg y series hellermann tyton 166 25802 the hellermanntyton 166 25802 hg21 y16 is a conduit y connector from the hg y series this fast fit y connector reduces the conduit size from an entry size of 21mm to two exit sizes of 16mm each the connector has been manufactured from polyamide 66 pa66 and is free from halogen sulphur and phosphorus hellermanntyton 166 25802 hg21 y16 conduit y connector ip66 entry 21mm exit 16mm