https://www.mskcc.org/cancer-care/patient-education/caring-y...Some info all in Eng, figure 4 near beginning, ((( looks like TWO Drain Tubes)))
It says there; One end of the catheter will be in the bladder. The other end of the catheter will extend from your body (see Figure 5). It will be attached to an external drainage bag strapped to your leg. This catheter lets urine flow in 2 directions. It can go out to the drainage bag or into the bladder.
( I do not know much about it, maybe some one else can help)