L-Unit

The L-Unit is one of the most critical parts of any space-faring vessel. It's made of 340 lbs (154.22 kg) of steel, is shaped like an "L", and without it space travel is little more than a fantasy. The L-Unit in the Planet Express ship was functional until it was bent straight, causing the ship to crash into the New New York streets. Leela believed it was sabotage until security footage revealed that Bender was sleep-bending, causing him to straighten/bend many things in the Planet Express headquarters without him being aware of it.

Trivia

 * Leela described the L-Unit's material as "Tonka tough steel".  is a division of the  toy company which sells trucks and construction equipment billed as "Tonka Tough".