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The Moen 104520 is a replacement commercial sensor eye and wires component

Technical Specifications

Product Type Sensor eye/wires assembly for flush valve.
Sensing Technology Proximity sensor, part of an electronic mechanism that works with a solenoid to activate flushing.
Compatibility For use with battery-powered Moen M-POWER commercial electronic flush valves.
Material Primarily plastic construction.
Mounting Type Surface mount.
Power Source The sensor itself does not require batteries; it draws power from the main flush valve power source (which is typically battery-powered).
Dimensions (L x W x H): 4.87 x 1.6 x 0.8 inches (12.4 x 4.1 x 2 cm).

The sensor is compatible with various Moen M-POWER flush valves, primarily within the 8310, 8312, 8314, 8315, and 8316 series.

For Closets (Toilets) - 1.5" water connection:

Moen 8310 (and its variants like 8310DF16, 8310R16, 8310AC16)

Moen 8311 (and its variants like 8311AC12)

For Urinals - 3/4" or 1.25" water connection:

Moen 8312 (and its variants like 8312AC10, 8312R10)

Moen 8314

Moen 8315

Moen 8316