A "7way PL" likely refers to a 7-way trailer connector used in the automotive industry to connect a vehicle to a trailer, transmitting power for taillights, brake lights, turn signals, reverse lights, and electric trailer brakes. The "PL" may be a manufacturer-specific designation or refer to the "plug" or "trailer" itself, while the 7-way connector's robust design ensures a secure, weather-resistant electrical connection for various towed vehicles.