Seal for water outlet at back of MC block...

[gerard]

Hi!

I just transferred the water pipe at the back of the MC engine block
from the old engine to my rebuilt unit. There is a seal in there that
was crusty as hell. I want to know if I should bother going to the Audi
agents/dealership/stealership for this item or can I use a o-ring of
some sorts.

Here is the part number from ETKA:

Seal	21x3N	N 900 351 03

21x3N sounds like the dimensions of the unit, so I can try on Monday to
see if my favourite little engineering supply store might have this.

G.