Fuel inlet servo
Fuel inlet servos were components of the matter/antimatter injector assembly on  starships.

During a brainstorming session in engineering with the senior engineering staff in an attempt to solve a problem with the fuel injectors on the  in 2366, Wesley Crusher suggested that the fuel inlet servos might be caught in cycle. Geordi La Forge responded that if the servos were caught in cycle, the swirl dampers would be frozen as well. ()
Warp