Demco Locking Plate For Morryde Pinbox 6025. Locking plates are required for Demco Glide Ride MORryde Trailair Tri Glide Trailair Flexair Trailair Rota Flex and 5th Airborn Pin Boxes. The Demco 6025 Locking Plate is for use with Demco's 5th Wheel...