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| PartNumber | M85049/39-21S | M85049/39-21A | M85049/39-21N |
| Description | Circular MIL Spec Backshells STRN RLF NONSELF LK SH SZ 21 STEEL | Circular MIL Spec Strain Reliefs & Adapters BACKSHELL SR R/A BLACK SZ 21 | Circular MIL Spec Strain Reliefs & Adapters BACKSHELL SR R/A NIC SIZE 21 |