Doing a PS flush.
I think this o-ring has seen a few years.
A) What do I replace it with?
B) What type of material does this o-ring use? EDPM, Buta-N, Vitron...?
The metal tube OD --> ID for the o-ring I measured at 9.2mm / .36"
The o-ring thickness (in its squished state) I measured at...