Piercing Cap For a Chub

A cap for use with a sleeve that receives a chub filled with a material to be expelled from the chub through the cap and onto a surface, the cap comprising:

• a base having a lower face with a downwardly depending skirt extending from the lower face, the skirt configured for receiving in or about a leading end of the sleeve, the base and the skirt together defining a cap body having a generally open or hollow interior,
• a bore extending through the base and defining a passageway from the open or hollow interior through the base, and
• one or more downwardly depending barbs positioned on the lower face and situated about the bore, the barbs piercing an end surface of the chub when the skirt is received in or about the leading end of the sleeve and when the end surface of the chub is received within a longitudinally oriented passageway through the sleeve and advanced toward the cap and forced against the barbs, the barbs configured to encourage movement of a portion of the pierced end surface of the chub away from the bore as the chub is forced against the barbs,
• wherein each barb includes a support web extending between the barb and the lower face of the base, the support web providing structural rigidity to the associated barb, the support web associated with a barb encouraging movement of a portion of the pierced end surface of the chub away from the bore as the chub is forced against the associated barb,
• and wherein a longitudinally oriented inner face of each barb is concave, defining at least part of a flow passageway encouraging the flow of material expelled from the chub through the bore.