The function of the Sprue Bushing is to provide a seat at the spherical radius
for the Nozzle of the press. The Sprue Bushing provides a
"path" for the material from the nozzle to the runner system.
The Sprue Bushing is located via the Locating Ring, and the A Retainer Plate,
and touches the B side of the mold at the Parting Line.
Click Image below to see Sprue Bushing in a MoldBase