You can find parts for the HydroFloss Oral Irrigator Here:
https://www.toothygrinsstore.com/Hydro-Floss-Parts-Original-Hydro-Floss-Parts-s/51.htm
You may find parts like, o-rings, pumps, hoses, tips, tip holders and more.
If you are looking for the tip holders, you may need to call the number above for that.