What This Housing Is For
The Hirose GT5W-1PP-HU is a waterproof housing in the GT5 series — it's the shell that holds the M-series crimp terminals, not a terminal itself. The gray PBT body gives it chemical resistance and a working temperature range suited to engine compartments and outdoor enclosures where moisture is a problem. If you're building a harness that needs to stay sealed after mating, this is the piece that makes that happen.
Waterproof Build, PBT Body
Listed as waterproof, the GT5W-1PP-HU housing is designed to keep moisture out of the terminal cavity when mated with the corresponding GT5 series plug. The Polybutylene Terephthalate (PBT) body resists fuels, oils, and solvents — a common spec for underhood or industrial washdown environments.
Terminal Compatibility: M-Series
This housing accepts M terminals. That's the Hirose crimp terminal family designed for the GT5 series — the exact terminal part number depends on your wire gauge and whether you need gold or tin plating. The housing provides the cavity retention and seal; the terminal carries the current.