Hellermanntyton conduit reducer hg r series hellermann tyton 166 25010 the hellermanntyton 166 25000 hg21 r42 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 42mm to 12mm the connector has been manufactured from polyamide 66 pa66 and is free from halogen sulphur and phosphorus hellermanntyton 166 25010 hg21 r42 ip66 conduit reducer 4