Assertion: catheter's tube | /r/MadeOf | polyurethane
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text: Either way, tubes made of latex, polyurethane, or silicone, typically somewhere in the region of 3.3 millimeters and 9.3 millimeters in diameter, are inserted in to your urethra—the pipe that carries your pee to the outside world—allowing urine to drain from your bladder into a bag, along one continuous drop of pipe.