Tip for a foam in place injection cartridge

A tip for a foam-in-place injection cartridge for directing a frothing mixture of cleaning solvent and air to the exit portions of the cartridge and comprising:

• a generally cylindrical body formed if a material that is porous to gases and liquids, but that is impermeable to the foaming compositions which otherwise exit the injection cartridge;
• a cylindrical core in said body that defines a mixing chamber for foamable compositions and through which a valving rod can pass to valve the dispensing of foamable compositions from the cartridge;
• and
• at least one circular face of said body forming a frusto-conical surface directed inwardly toward said body so that when a mixture of cleaning solvent and air is directed through said body, a frothing mixture of air and solvent will exit said frusto-conical surface to provide cleaning action over a linear dimension at least as great as the distance said frusto-conical surface faces inwardly in said body.