diameter 122 is between approximately 1 0 inch and 1 5 inches in some embodiments the head cone recess diameter 122 is approximately 1 19 inches now referring to fig1 a cross sectional view of a plunger 2 having a chemical delivery system is provided the plunger 2 may store various chemicals to provide additional functionality to the plunger 2 for example the plunger 2 may deliver corrosion inhibitors scale inhibitors soaps biocides lubricants etc and combinations thereof during the plunger 39 s 2 descent ascent or position at the bottom of a well hole as shown in fig1 a pump 124 is provided in a portion of the plunger 2 which in this embodiment is a portion of the head cone 8 in alternative embodiments the pump 124 may for example be disposed within the interior volume of the chassis 4 the pump 124 may be suspended within the interior volume or positioned to one side to allow fluid to enter the entrance aperture and pass through the interior volume of the chassis it will be further appreciated that many different types of pumps 124 may be used to generate a pressure differential and to displace a volume of one or more chemicals in this embodiment a single piston pump 124 is used to store and deliver a volume of one or more chemicals the one or more.