The Skoda washer fluid cap(part number 000096706) is an improved better version of the default Cupra cap (a variant of the 1H0955455 cap that's in basically all VAG cars). It's made from TPE instead of PE and acts as a funnel and a lid at the same time. It's also less fragile at lower temperatures.
The old, flat, hard plastic cap:

The new, better one:

The part is also available on everybody's favorite Chinese webstore if you want.
All in all, this is a super cheap and easy retrofit!
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Comments 2
Все эти крышки, продаваемые в Китае, являются подделками. Они очень легко ломаются на сильном морозе.
This is an essential part of any car. I have seen them installed on a bunch of other brands. The most convenient and durable thing you can buy.