Fuel converter
A fuel converter was a piece of technology used aboard the  during the Antarian Trans-stellar Rally to allow it to run on enriched deuterium as required by the race's guidelines. 

One was given to Tom Paris by another racer, Irina, as part of her plan to sabotage the race. Veridium isotopes leaked into the Flyers warp core, causing the converter and the warp core to explode. ()
Propulsion technology