Glossary A-CC-CD-EF-GG-II-MN-PP-SS-SS-TT-VW Porosity voids or pores resulting from trapped air or shrinkage in a casting. Port opening through which molten metal enters the injection cylinder of a plunger machine or is ladled into the injection cylinder of a cold chamber machine. Rod,tie a bar used in a casting machine to hold dies locked against pressure and, in general, also serving as a way along which the movable die platen slides. Runner die passage connecting sprue or plunger holes of a die to the gate where molten metal enters the cavity or cavities. Shot that segment of the casting cycle in which molten metal is forced into the die.