I use Irritec Y-filters for irrigation wells, and over time, the gasket on the filter cartridge hardens up and breaks.
This gasked can be printed from TPU (95A or similar) and is a drop in replacement for the ring gasket. You need two, one for each end of the cartridge.
Print it with TPU 95A or softer, and with 0.2mm layer height.
The author marked this model as their own original creation.