Genuine OEM replacement steam switch for the Gaggia Classic Pro V3 (2019) espresso machine. Rated 16A 250V with "steam" silk screen printing and 22×30mm mounting footprint — a direct fit, no modifications required. Specifications Part Number: 421944090551 Rating: 16A 250V Mounting: 22×30mm Printing: "Steam" silk screen Compatibility: Gaggia Classic Pro V3 (2019+) Source: Official Gaggia Spares Frequently Asked Questions What does the steam switch do on a Gaggia Classic Pro? The steam switch activates the steam boiler circuit, allowing the machine to heat water to steam temperature for milk frothing. A faulty switch can cause the steam function to stop responding or remain permanently on. Is this switch compatible with my Gaggia Classic Pro? This part (421944090551) is designed for the Gaggia Classic Pro V3 released from 2019 onwards. If you have an earlier Gaggia Classic (pre-2019), please check your model number before ordering. How do I replace the steam switch on a Gaggia Classic Pro? Replacing the steam switch requires removing the top panel and disconnecting the spade connectors from the old switch. Always unplug the machine and allow it to cool fully before starting. If you're unsure, we recommend consulting a qualified technician.