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From Liquipedia StarCraft Brood War Wiki
[e][h]Zerg Extractor
Building Information
Minerals 50 Vespene Gas 0 Build Time 25
B → E
750 1

The Extractor is a required building for Zerg to harvest Vespene Gas. Analogous to Protoss Assimilators and Terran Refineries, Extractors can only be built on Vespene Gas Geysers.

Building an Extractor can also be part of the Zerg Gas Trick to morph an extra Drone earlier, but the benefits are rather nominal.

In occasional early game circumstances, the Zerg player may build an Extractor on the Geyser of the opponent's main base to disrupt the opponent's build order.

When sending workers to mine from an extractor as it is completing, if you use the gather-command-left click on the incomplete extractor instead of right clicking, the workers will mine from the extractor if it is completed by the time they arrive.

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