Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Thorlabs
Thorlabs FOA03 is the exact manufacturer part number for Fixed Attenuator, 3dB, In-Line, SMF-28. The official catalog lists this item as discontinued. Submit the exact part number, quantity, destination, and application details for an RFQ.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Thorlabs FOA03. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.