www.pmmag.com/articles/88289-general-pipe-cleaners-flood-guard
General Pipe Cleaners' Flood Guard
March 1, 2005

Prevent basement flooding with General Pipe Cleaners' Flood-Guard®. Available for 2-, 3- and 4-inch floor drains, it operates like a check valve to seal off water backup caused by overloaded sewers.
Circle 2