These back shells from Amphenol not only provide the cable support and strain releaf, but ensure the cable sealing and environment protection by means of a high quality sealing grommet and and grommet follower. Strain relief nut is tightened squeezing the grommet on to the cable jacket during assembly. These back shells from Amphenol gives 6 feet water protection when used with perfectly jacketed cable and are suitable for harsh environment applications.