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To reduce debris on top of sub surface tools.
Junk Catchers are made up of 2 components:
2. End Cap
Tighten end cap onto fishneck and attach to GS running / pulling tool and hoistinside of lubricator. Lower into wellbore to top of sub surface tool, jar down toshear GS. Remove toolstring from wellbore.
If a large amount of debris is expected, an extension barrel may be added toaccommodate added volume. Ensure that jarring down to release the junkcatcher will not damage equipment below.