This adapter replaces the factory's first regulator, it recovers the plenum chamber faster for a followup shot. It is highly recommended for PRS shooting style or hunting with no worries of the FPS dropping, causing your POI to change
 
Works with the old and new versions FX bottle valves
Helps in high powered pressure settings, allows you to run a higher pressure regulator directly in the plenum for the heavy slug shooting
This reg bypass is made of stainless steel to prevent rusting