The TE Connectivity / AMP Brand part 4-1437284-3 is a reliable and durable cavity plug designed to seal unused connector cavities. Measuring 9.7 mm long and 3.0 mm wide, this plug is compatible with various connectors. It features pre-assembled secondary locks that guarantee proper contact insertion and a secure fit. With its innovative design, the secondary lock will not close if contacts are incorrectly inserted, ensuring optimal performance and preventing any potential damage.