The AH165-RJM2A22A is an oil-tight 2-position selector switch manufactured by Fuji Electric, designed for industrial control applications requiring sealed operation in harsh environments. This switch features a key operator with round bezel in the A position (removable key location), maintained operation mode, and a 2NO+2NC (2 normally open + 2 normally closed) contact arrangement. The switch is mounted using a washer and nut configuration with a maximum panel thickness of 4 mm and a mounting hole diameter of 24 mm. As part of the AH165 series, this selector switch is oil-tight rated and UL, CSA, TÜV, and CCC approved, making it suitable for machine tools, industrial machines, control panels, and distribution panels where reliable switching and environmental protection are critical.