I did a google search on where to find Weber & Judd reservoir catheters: https://www.google.com/search?...5i304i39.oqmay0CO_uk
and found this: https://www.gpihealth.com/osto...theter-31-fr-2-slots it's a bit pricy but it has 'in stock' on the form. But in the search results there is another site that had them for more money.
I hope this helps. Good luck.