EXTENDED ORIFICE PLUG FOR A FLUID SYSTEM

An assembly (20) is provided for a fluid system. This fluid system assembly includes a fluid conduit (22) and a plug (82). The fluid conduit (22) has an internal bore (78). The internal bore (78) is configured as or otherwise includes a smooth-walled internal bore (78). The plug (82) includes a protrusion (90) and a head (92). The protrusion (90) is connected to the head (92). The protrusion (90) projects axially along an axial centerline (40) partially into the smooth-walled internal bore (78) to a distal end (86) of the plug (82). The head (92) is seated against the fluid conduit (22). The head seals an opening in the fluid conduit (22) to the internal bore (78).