O-rings are similar are they, which one should I buy for my Domino A100 printer? Don’t worry, let me make a portfolio of all the o-rings compatible to Domino A series CIJ printer.
The first one on top left is DB06035, which is for 64k drive rod. The second one on top right is DB04150, suitable to venturi tube. The two o-rings at the bottom, DB04183 and DM-PY0097 are for pressure transducer and solenoid valve.

It’s difficult to tell your supplier the diameter, thickness of the O-ring you are looking for, but, if you can tell us on which spare part it’s used on, we can quote and deliver the right O-ring to you asap.
If you have any questions about the O-rings, please feel free to contact us.