A good thing to have a spare!
The replacement part for these model:
Original and authentic part from Thermos Malaysia
Part does'nt come with box
Stopper come with the blue rubber ring and rubber nut as below:
1 x Thermos Spare Part for Thermos FFZ ( FFZ-500F / FFZ-501F / FFZ-800F / FFZ-801F / FFZ-1000F / FZ-1001F)
Hush A Buy