Are you sure it is supposed to have a metal seal. I asked about that on this board and one replied that there are no metal seals and to just replace the orings. Cured the leak.

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96 Legacy LSi wagon
92 Mitsu Expo
95 525iT
1983 300TD clackclackclack sold
1972 Toyota Corolla wagon TE28 sold
1991 Galant VR4 pshhhhh non-op
1989 Montero RS pop's ride