The polarized PUD series housings incorporate a finger-friendly design for ease of mating and un-mating. Available in 8 to 40 circuits, the locking mechanism is designed for a secure and stable connection ideal for high vibration applications. The housing receptacles are keyed to prevent accidental reverse mating or to a header without the same number of circuits. An audible click is heard when mating the receptacle housing assembly with the mating header.