For question about enclosures and components rated to IP67, which specifies total protection against dust and immersion in liquid between 15 cm and 1 meter.

The IP (Ingress Protection) rating of a device specifies what level of environmental protection it has against solid objects and liquids as indicated by the first and second digits respectively. Sometimes a third digit is used to indicate mechanical impact resistance. For further details on the meaning of the codes see IP Code.