Subaru Robin PKX201 - Manual (Page 79)

High Pressure Pumps - PKX Service
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17. Use a small screwdriver to pry between the ceramic
seal and the black rubber seal that holds it in place.
18. If the seal seems to be stuck, squirt some liquid soap
on the seal .This will loosen it from the black outer
rubber seal. Using one or two screwdrivers, pry the
seal outward. It may become necessary to remove the
pump backplate when the seal is stuck . See step 22
for removal of backplate.
19. This is what the seal will look like when removed.
20. Make sure never to use the back side of a seal when
re-installing. The back side of the seal will usually
have some colored marks indicating it is the wrong
way.