Cable Entry Seal, Watertight, Heat Shrinkabe - Easy to install, heat shrinkable cable entry seals provide a watertight, fume tight seal where cables enter connection boxes or other enclosures. This cable entry seal consists of a three part assembly of a rigid plastic nut, an o-ring, and a moldable heat shrinkable nose. This creates water seal on the entrance into walled enclosure of up to 3/16" thickness. Meats or exceeds MIL-I-81765/1A Seals per U.S. Coast Guard HQ3774. Temperature Range: -55°C to 90°C.