I've tried searching for the part number for a coolant cap, no joy though.
Just been out to my Astra G 17 dti to drain the water system again, been flushing the sod out for the last cpl of weeks as I think my new oil cooler has gone tits up again and I get a film of oily grey crap in my water bottle.
It's coming cleaner now but today I looked at the rubber seal inside the yellow cap and it has a slight split so I took it out to inspect but now can't get the seal back in as it seems to have grown and won't push back into the cap if you get my drift.
So I'm better getting a new one I think not sure what the part number is tho
Thanks in advance.