disc 50 has a greater diameter than other intermediate disks and cooperates with annular protrusion 52 to snap fit piston 20 within upper sleeve 22 and lower sleeve 24 when disposed within sleeves 22 and 24 piston 20 may traverse freely up and down with a loose fit which may be friction free enough to allow piston 20 to move under force of gravity alone up and down the sleeves at one end of such a movement capping disk 32 may contact segmented tip 26 and under pressure from plunger 20 may force segmented tip 26 to open if materials to be injected are in front of capping disk 32 they may also force segmented tip 26 to open annular protrusion 52 acting in cooperation with enlarged disc 50 prevent piston 20 from accidentally being removed from upper sleeve 22 while still allowing piston 20 to be snapped free from upper sleeve 22 when force is added in use finger grip nut 28 is removed from upper sleeve 22 by unscrewing internal threads 46 from engagement with attachment threads 34 and lower sleeve 24 is then detached from upper sleeve 22 materials to be injected are then placed within lower sleeve 24 and lower sleeve 24 is then reattached to upper sleeve 22 by reversing the above described process plunger 20 is then inserted into upper sleeve 22 through upper sleeve entry opening 48 segmented tip 26 is then inserted into the food to be injected and finger.