Product Description Product Reviews NEXIQ 604020 Universal J560 PLC Adapter The Universal J560 PLC Adapter extends the capability of J1708/J1587 diagnostic tools to support J2497 Power Line Carrier (PLC) communication. For use with trailers with PLC communications. Accessories: 604020 | Universal J560 PLC Adapter, Replaces PN 421001 For Use With: 188080 | Versatile and Reliable