Abstract: An apparatus provides drain passages in an annular channel in the lip of a metal container for fluids. A metal or plastic support is shaped as an annular ring. Each punch of a plurality of metal punches has a corresponding base and point. The base of each punch is integrally connected to a front face of the support such that each point projects perpendicularly to the front face and in a common direction parallel to an axis of the annular ring. The punches are spaced so that each point can be aligned simultaneously with the annular channel of the metal can. The rear face of the support comprises a surface for driving the punches through the annular channel and creating fluid drain passages in the channel. The support can comprise a spoke-configuration having spokes extending from a hub. The base of each punch is integrally connected to extend from a corresponding spoke.