Found these in a cupboard. They probably belonged to a previous resident as we don’t recognise them. I put the numbers into Google and the result seemed to indicate that they were for a car fuel filter (an old one as there was no exact match), They are sealed so never been used (might be repurposed as a wine filter or similar!). Written on one side is:
4CT
GERMANY/ALLEMAGNE
3195C 18089 32572