R7 thrust coupling
From Halopedia, the Halo wiki
The R7 thrust coupling can be described as a thug to get spaceships out of orbit and into space. Using these was concidered basic math for a UNSC Frigate or Corvette, but it was more difficult for a UNSC Cruiser, requiring at least 8 R7 thrust couplings. They are compatible with a Class-L flash doc.[1]