1. n. [Shale Gas, Well Completions, Well Workover and Intervention]

Flow control unit used in the pressurization of fluid employed in hydraulic fracturing. Fracturing fluid enters the missile at low pressure and is directed to the pump trucks for pressurization. High-pressure fluid returns to the missile and is directed to the well or, in the case of a multiwell pad, to a frac manifold.

See related terms: trunk line,  zipper manifold