Hellermanntyton conduit fittings with fixed external thread hgl s straight hellermann tyton 166 21604 the hellermanntyton 166 21604 hgl28 s is a straight fitting with an m25 external thread and belongs to the hgl s series this one piece connector has been manufactured from polyamide 66 pa66 the connector is highly resistant to solvents and oils and is supplied complete with a conduit seal and washer hellermanntyton 166 21604 hgl28 s m25 ip68 straight conduit fitting m25 228mm