![Flux coupler](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/7/74/Flux_coupler.jpg/revision/latest/scale-to-width-down/180?cb=20060613144158&path-prefix=en)
A flux coupler
A flux coupler was an engineering tool that looked similar to a coil spanner.
In 2154, while discussing events that had taken place on a version of Enterprise NX-01 that had been thrown back into the past, Sub-Commander T'Pol asked Commander Charles Tucker III to hand her a flux coupler. (ENT: "E²")
While setting up a gravity simulator, Lieutenant Commander Airiam reminded the engineering team in the USS Discovery's shuttlebay that they would need a flux coupler to activate the power relays. (DIS: "Brother")
During a salvage mission to Empok Nor in 2373, Elim Garak killed Amaro with a flux coupler while under the influence of a psychotropic drug. (DS9: "Empok Nor")
Ensign Rutherford used a flux coupler while on repair duty with Ensign Tendi. (LD: "Cupid's Errant Arrow")