The most common problem with urinals is their tendency to "run." There is a joke in there somewhere, but before you have to shut the water off to the entire home or office, you may want to consider this quick fix. With little more than a screwdriver, a pair of channels locks, and a Sloan replacement diaphragm, you can fix a running urinal and save yourself the exorbitant cost of having a plumber, in all likelihood, coming out and performing the same actions.
Locate the secondary water shut off. This is typically found at the first joint protruding from the tile or wall. It is usually hidden under a chrome cap that can be popped off manually or with a screwdriver. (In the accompanying photo, it is the black disc protruding from the pipe in the wall).
Use your screwdriver to turn the water shut off screw to the left, stopping the flow of water to the urinal.
Using your channel locks, turn the octagonal or hexagonal bolt located on top of the flush head. It is the only large octagonal or hexagonal screw on the flush head.
Fully loosen the screw and remove the flush head's cap. As the screw loosens, don't be alarmed if some remaining water pours out of the head.
Locate the diaphragm. It is the large, black disc in plain site, taking up the majority of the flush head's innards.
Remove the old diaphragm and replace with the new Sloan diaphragm.
Replace the flush head and screw the octagonal (or hexagonal) screw back in place.
Slowly turn the secondary water shut off to the right, restoring the water supply to the urinal. Flush and observe.