It is a free-hanging (in-line) plug designed for crimp contacts, with a 4.00 mm pitch and two rows spaced 6.00 mm apart. The housing is sealed, making it suitable for applications where moisture or splash exposure is a concern — typical in automotive underhood harnesses, industrial controls, and outdoor power equipment.
The housing is black, molded from glass-filled PBT, and uses a slide-on fastening type. The base product number is 1564512, and the package is bulk.
The 1-1564412-1 is the same MCP 1.5K plug housing but with 18 positions instead of 8. Both share the 4.00 mm pitch, sealed construction, slide-on fastening, and free-hanging mount.