I have a 2 3/4 inch drain, where can I get a 2 3/4 flood guard? Thanks ed

You piggybacked onto a old thread so I gave you your own.
For a selection click on, Flood guards for floor drains - check valve to prevent flooding from FAMOUS PLUMBING SUPPLY (http://www.plumbingsupply.com/floodguard.html)
Good luck, Tom