SC Pigtail: Square connector, push-pull, common in telecom and FTTH. E2000 Pigtail: High-performance, dust cap, often in. A pigtail connector is a small wire that makes a big difference. One side features a molded plug or socket, while the opposite has exposed conductors. Pigtail connectors are. Yet for many buyers, engineers, and procurement specialists, the question remains: What exactly is a pigtail connector, and why does it matter so much in modern design? A pigtail connector is a short, pre-terminated length of cable with one end connected to a connector and the other end left open. What is a pigtail connector? 2. The opposite end is left bare or stripped, ready to be spliced, crimped, or soldered into an existing circuit.