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

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.

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