Hellermanntyton conduit y connector and reducer hg y series hellermann tyton 166 25803 the hellermanntyton 166 25803 hg28 y21 is a conduit y connector from the hg y series this fast fit y connector reduces the conduit size from an entry size of 28mm to two exit sizes of 21mm each the connector has been manufactured from polyamide 66 pa66 and is free from halogen sulphur and phosphorus hellermanntyton 166 25803 hg28 y21 conduit y connector ip66 entry 28mm exit 21mm