Restaurant Urinal Valve leaks

Hi,

I am doing some services for a friend that owns a restaurant and she has a leaking Urinal in the men's bathroom. It leaks when you push the Manual Push button right at the nut before the Vacuum Break assembly. The maker is Chicago Faucets and the model number is VB-50. I cannot find any information on this faucet valve. I was wondering if there was any cross parts that would work for this valve? Can anyone tell me where a good parts place is for plumbing stuff like this?

Thank You for any help you can give.

Chicago is a division of Geberit.
VB50 does not sound like the flush valve model number. I'm guessing it's the Vacuum breaker part number.
You can found a distributor near by putting your zip code in this site.
http://www.chicagofaucets.com/scripts/site/parts_distributor.php

I know Ferguson has Chicago (Divison of Wolseley) and you can find a location near you as well.
http://direct.where2getit.com/cwc/apps/w2gi.php?template=search&client=fergusoninc