The utility model discloses a seal subassembly, including shell, inner core and seal, the shell is at least one end open -ended hollow structure's cylinder, the inner core holding in in the shell, be equipped with first recess on the inner core, the seal accept in in the first recess, the inner core with the shell passes through magnet fixed connection. Be different from current take off the lid get put the seal, flip gets the mode of putting the seal, the utility model provides a seal subassembly gets through the mode of push -and -pull inner core puts the seal, brings huge convenience for the user, it is fixed with inner core and shell through magnet, can avoid seal subassembly non - expectancy to appear and open, convenience of customers carries, the inner core sets up the fourth recess and can keep away the position and can avoid the inner core to take place to rotate in the shell through the first magnet and the cooperation of fourth recess first magnet, the user is getting when putting the seal, can support a seal through the bottom trompil of first recess, is favorable to further convenience of customers to get and puts the seal.