Epoxy and caulk plunger blowout preventer

A dispenser for use with a cartridge having a plug, the plug including an annular wall, the dispenser comprising:

• a body;
• a cartridge retainer configured to be connected to the body, the cartridge retainer forming a chamber configured to receive the cartridge therein, and a distal aperture;
• a pushrod configured to slide relative to the body into the cartridge retainer toward the distal aperture, the pushrod having a distal end;
• and
• a plunger positioned at the distal end of the pushrod, the plunger comprising:
• a first section including a first side surface and having a first diameter, the first diameter being a maximum diameter of the plunger;
• a second section forward of the first section so that the second section is configured to engage the plug ahead of the first section, the second section including a second side surface and having a second diameter smaller than the first diameter;
• and
• an intermediate section between the first section and the second section, the intermediate section having a third side surface tapering from the first side surface to the second side surface such that a maximum diameter of the intermediate section is equal to the first diameter so that the intermediate section is configured to urge the annular wall radially outward against the cartridge thereby forming a seal between the annular wall and the cartridge when the plunger is urged longitudinally toward the plug via the pushrod.

A dispenser for use with a cartridge having a plug, the plug including an annular wall, the dispenser comprising:

• a body including opposing molded shells mated together;
• a metal cartridge retainer configured to be connected to the body, the cartridge retainer forming a chamber configured to receive the cartridge therein, and a distal aperture;
• a pushrod configured to slide relative to the body into the cartridge retainer toward the distal aperture, the pushrod having a distal end;
• and
• a plunger positioned at the distal end of the pushrod, the plunger comprising:
• a first section including a first side surface and having a first diameter, the first diameter being a maximum diameter of the plunger;
• a second section forward of the first section so that the second section is configured to engage the plug ahead of the first section, the second section including a second side surface and having a second diameter smaller than the first diameter, the second section and the first section having equal longitudinal thicknesses;
• and
• an intermediate section between the first section and the second section, the intermediate section having a third side surface tapering from the first side surface to the second side surface at 45 degrees from a longitudinal axis such that a maximum diameter of the intermediate section is equal to the first diameter so that the intermediate section is configured to urge the annular wall radially outward against the cartridge thereby forming a seal between the annular wall and the cartridge when the plunger is urged longitudinally toward the plug via the pushrod, the intermediate section having a longitudinal thickness smaller than the longitudinal thicknesses of the first section and second section.