Valve

Valve is an Autobot Wrecker and a Decepticon Squadron X member from the Generation 1 continuity family.

You can't see me!

_{This character has no official visual representation in any Transformers product or media... yet, at least.}

Valve seems a bit indecisive. He is Spark brothers with Springarm and Wheelarch.

Fiction

IDW Generation 1 comics

Valve was a founding member of the Autobot Wreckers. He later defected to the Decepticons and became leader of Squadron X. He was succeded in that position by Macabre. Macabre's Squadron X profile