Plunger seal vs. Rinse seal

[sepr8tr]

We have a Shimadzu LC-10ATvp and need to replace both the plunger seal and the rinse seal. I am wonder what the difference is between these two items because they are very similar in appearance.

[elsico]

Different color?) Very poor pictures in manual so i'm not sure which is plunger.
But normally black one is plunger seal.

[Alfred88]

Hi.
I have serviced the Shimadzu HPLC for >10 years. The plunger seal (black/yellow) and back seal (white) are almost the same. However, the back seal is not strong as the plunger seal.

Do you want to use motor oil (color code yellow) as a substitute for antifreeze (color code green)?

Note: I do not work for Shimadzu.

Alfred