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[Andy B]

You can find stainless steel pipes here https://acsparts.biz/en/cooling-pipe-90411629-opel-ss/
Never used this ACS part but I'm sure it's the same quality level as their oil cooler

4 things to know, as it happened when I changed mine this summer :
- The new thermostat housing can have higher cast's dimensions where you put the bolts. I grinded the aluminum of the housing to reuse original bolts.
- The original pipe was very very difficult to remove, even if it was free from any bolt, still impossible to extract. I used a heatgun to locally heat the pipe where it's inside the thermostat housing, in order to dissolve the crap around the o-rings, and it finally worked, without breaking anything.
- Can be useful to remove the 3 electrical plugs aside the ECU box, to clear the space and access.
- New o-rings ordered separately felt very thin and I was not confident with them. I put some Loctite 5923 inside the housing (because if you put directly on the pipe you need too much dexterity to avoid choping the loctite when passing through the tunnel).

I don't know if I'm clear because I feel that I can use more precise vocabulary, which, as a French baguette, I don't have 

Very clear!   

[Migv6 le Frog Fan]

The link to the stainless pipe is very useful as they are difficult to source these days.