Washer Water Bottle seal

I'm having trouble with my wipers, and the online community seam to think it's the washer pump on my k12 1.5 dci SE.
Now having removed the pump, i can't see any sort of rubber seal in the hole into which the pump fits. Have I lost a little bit or is there no seal or grommet and it"s just a push fit.

Many thanks
Mark
 
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