Riser
A gate set on the top or leading from the side of a casting, either to indicate when the mould is filled with metal or to be used as a means for introducing fresh supplies of hot fluid metal to make good the deficiency caused by shrinkage. In the latter instance the riser is often called a cut-off or flow-gate; in the former the terms "rising-head" or "feeding-head" are commonly used. See CUT-OFF; FLOW-GATE; FEEDING-HEAD; FEEDING-ROD.