Morris 22552 Cable Gland, NPT Thread, Nylon, 1/2" Thread Size, 0.394"-0.551" Cable Size Nylon Cable Glands NPT Thread - NPT Thread Cable Glands are watertight and durable. Seal & clamp system allows the cord connector to tighten in a circular sequence on the sealing ring to give outstanding strain relief without twisting or damaging the cable Simply push the cable through the liquid tight Nylon strain relief & tighten locknut for quick installation Threads into your panel for clearance, locknut included Internal Ratchet with Self-Locking feature protects against vibrations