Klinovec CZ
Meanwhile I found a shop online here in Germany that sells small quantities.
I measured 4.0\*1.75mm. A 4.0\*2.0 would work also I guess..
PS:
[https://www.ir-dichtungstechnik.de/gewerbe/de/o-ring-4-0-x-1-75-mm-nbr-70-5-shore-a-schwarz-black.html](https://www.ir-dichtungstechnik.de/gewerbe/de/o-ring-4-0-x-1-75-mm-nbr-70-5-shore-a-schwarz-black.html)
Works so far...
Here is a complete service guide for the cartridge (includes IFP setting instructions!)
[https://www.instructables.com/Servicing-the-non-servicable-OneUp-Dropper-Cartrid/](https://www.instructables.com/Servicing-the-non-servicable-OneUp-Dropper-Cartrid/)
Jan. 11, 2022, 12:34 p.m. - cxfahrer
Klinovec CZ Meanwhile I found a shop online here in Germany that sells small quantities. I measured 4.0\*1.75mm. A 4.0\*2.0 would work also I guess.. PS: [https://www.ir-dichtungstechnik.de/gewerbe/de/o-ring-4-0-x-1-75-mm-nbr-70-5-shore-a-schwarz-black.html](https://www.ir-dichtungstechnik.de/gewerbe/de/o-ring-4-0-x-1-75-mm-nbr-70-5-shore-a-schwarz-black.html) Works so far... Here is a complete service guide for the cartridge (includes IFP setting instructions!) [https://www.instructables.com/Servicing-the-non-servicable-OneUp-Dropper-Cartrid/](https://www.instructables.com/Servicing-the-non-servicable-OneUp-Dropper-Cartrid/)