An environmental relay conduit was a component inside the construction of an NX-class sickbay. It could be used to spread gaseous chemicals throughout the ship and was operated from the vessel's environmental controls console.

In 2153, an environmental relay conduit was used by Doctor Phlox to disperse a particular gas throughout Enterprise NX-01, attaching a vial of the chemical to the conduit. (ENT: "Chosen Realm")

The name "environmental relay conduit" comes from the final draft script of "Chosen Realm" (as does the term "environmental controls console").
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