Right - I meant 20kPa!
But I still only find pressure sensor, which I think are not suitable for water / wet use.
I found this one, but I am not sure, whether I can use it in water..
https://www.conrad.de/de/nxp-semiconductors-drucksensor-1-st-mpx2200ap-0-kpa-bis-200-kpa-print-1182857.html?sc.ref=Product%20Details