Gaggia Classic Pro: Decompression Duct Issues

by Whole Latte Love 2 min read Updated: July 15, 2025

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The chrome tube located on the left side of your Gaggia Classic Pro in front of the reservoir is known as the decompression duct. The purpose of this duct is to direct water from the three-way solenoid valve into the drip tray. Sometimes in shipping the internal parts that hold the decompression duct in place will shift around and either block the tube from being inserted or allow it to fall back out after insertion. The video below will show you how to check out those internal parts to make sure everything is properly situated: