a thread for screwing the metal removable cap onto a threaded opening of a container;

a continuous ring forming a retaining bead within the metal removable cap, the continuous ring being separate from the thread; and

a two-part wad comprising an upper cap layer and a bottom container layer, wherein

when installed the bottom container layer seals the container,

the retaining bead retains the two-part wad until removal of the metal removable cap from the container whereupon the upper cap layer of the two-part wad separates from the bottom container layer of the two-part wad,

the bottom container layer being releasable by the continuous ring with the upper cap layer of the two-part wad being held inside the metal removable cap and continuing to be retained by the retaining bead, and

the continuous ring protrudes farther into the metal removable cap than the thread.