Hellermanntyton conduit reducer hg r series hellermann tyton 166 25002 the hellermanntyton 166 25000 hg16 r21 is a conduit reducer connector from the hg r series this connector can be used with the y connectors hg y series order codes 49 6503 to 49 6506 inclusive the connector reduces the conduit size from 21mm to 16mm the connector has been manufactured from polyamide 66 pa66 and is free from halogen sulphur and phosphorus hellermanntyton 166 25002 hg16 r21 ip66 conduit reducer 2