Buy your self a cheap snake in the local hardware store, and make a small bend about 1/2 inch after the spring part make it look like a bend finger and snake away.
I am assuming that you are talking about a wall hung urinal! Most urinals have a mounting bracket where the urinal seals against the drain line. There is a soft foam gasket that makes the seal between the urinal and the drain line. First, secure the water to the urinal, remove the flush valve, there are usually 2 screws or bolts located on at the bottom of the urinal, unscrew these and remove the urinal from the wall, replace the gasket and then replace the urinal in the reverse of removing.
stoppage / broken water line /under ground seepage
a urinal
l urinal
Stoppage
dark water evaporates first
Boiling water is evaporated first.
flow restrictor
one inch for a water closet, 3/4 for urinal
A moratorium is a stoppage of pause (in this, of deep water, offshore oil drilling). It is difficult to view a stoppage - since nothing happens when a process is on pause or stopped. ;)
If it is a grease, soil or other soft stoppage Water Jetting is the way to restore full flow If the stoppage is hard such as roots /rags then snaking it the only option
Stoppage down stream