Venting plunger for caulk cartridges

An improved plunger for caulking cartridges, comprising a generally cylindrical peripheral wall having an outer surface adapted to engage an inner surface of the tube forming a cartridge, said outer surface having at least one longitudinally-oriented pair of projections extending the axial length of said outer surface and forming a gap for venting of air therepast, said projections each having a width of approximately 0.020 inch, and a height of approximately 0.004 inch whereby said gap will vent compressed air without permitting passage of caulking material as said plunger is advanced against said caulking material.