The 327 modular adapter plug is used primarily
             to connect modular handset or headset equipment
             to PBX consoles. There are twin prong plugs at
             one end and a modular jack at the other.

                ***(PJ-327 DISCONTINUED)***

             310 PLUG: 3 conductors telephone plug,
             (Tip, Ring, Sleeve). Can be used for
             patch cords and also for coiled cord.

PJ-213: Three electrically independent, 3 conductors plug, black handle. Similar to Switchcraft 414.

PJ-396: Two electically independent, 2 conductors plug, black handle. Similar to old Mil.type PJ-298, WE-298B, Switchcraft 412.