This part of ISO 15407 specifies the following requirements for a mounting interface and electrical connector for five-port pneumatic directional control valves, sizes 18 mm and 26 mm, for use at a maximum rated pressure of 1,6 MPa [16 bar]: — dimensions and tolerances of the interface features; — port identification; — identification of the result of control-mechanism actuation; — dimensions, tolerances and specifications for optional interface electrical connector mateability. It is not applicable to the functional characteristics of interfaces. NOTE The requirements for mounting interfaces of five-port directional control valves, sizes 18 mm and 26 mm, without electrical connector are specified in ISO 15407-1.