O-ring set for your SNOTTY THREE nasal aspirator.
The small o-rings go on the top of the collar plate where the collection cup attaches (you can see the two grooves when the collection cup is removed.
The o-rings seal between the collar plate and collection cup.
*If you have low suction your problem is most likely due to the lack of cleaning or damaged o-ring/o-rings.
The large o-rings go on the bottom end of the upper cover of the Battaery Case. You will need to remove the lower cover of the Battery Case to see the o-rings.