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.

Festo
The Festo part number 173121 is an electrical industrial component featuring a 5/3 closed valve function and a piston slide design structure with a positive overlap lap. This 17.8 mm wide unit provides a standard nominal flow rate of 600 l/min, a nominal size of 5 mm, an 18 mm grid dimension, and an operating working pressure ranging from 3 to 8 bar utilizing internal piloted air supply with a mechanical spring reset. It is equipped with IP65 protection class, soft sealing principle, throttleable exhaust-air function, non-reversible flow direction, and c UL us recognized authorization alongside a CE symbol according to the EU low voltage guideline. Submit the exact part number, quantity, and application requirements to receive a quote.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Festo references — within one business day.
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 Festo 173121. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.