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If it has an integral trap, pull it off the wall. If it has a removable P-trap under it remove the P-trap. Once you gained access to the pipe the power rod the line, then ensure the urinal itself is clean, rehang the urinal or replace the p-trap, test flush and look for leaks.
The only more would be a new seal for the wall hung integral trap urinal.
I have always called that brass flange a urinal spud. Ron gave good advice about the flushometer tailpiece o-ring. That's a key one right there. I usually pull urinals, back rod them, clean any "sugar" out of the drain line and re-hang them. I figure 1.5 hours per urinal.
Muriatic acid......but that cheese turns to stone in that piping. It'll get it flowing though.
Just last friday I was contemplating this exact idea! My Best Plumbing salesman sells urinal cleaner that is Hydrochloric acid. Researching this, I found Muriatic acid is another name for it. I have 2 gallons of Muriatic sold as RV cleaner. But, I don't know the mix rate? I fugured to pour a quart in and let it set over the weekend, then flush it. How does that sound?
I've got 50 urinals on campus, something needs to work.
If you want to use a chemical go for some Calci-Solve Stuff works great. I also use it in tank type water closets. Pour a quart down the overflow tube and let it sit for 10 minutes. The water closet will flush like brand new. http://www.nycoproducts.com/products.asp?pid=79