valupea, mille täidab kuum sulametall enne vormiõõnesse sisenemist (vt valupea; vrd külm valupea), a riser which receives material (metal) from the gating system and fills before the mold cavity; such risers are usually smaller than cold (dead) risers receiving material that has already flowed through the mold cavity (see: riser; compare: dead riser)