Say goodbye to nasty cockroaches, fruit flies and odors coming from the floor drains behind your bar or in your kitchen with a 3.5” floor drain trap seal. This one-way silicon valve makes drains virtually maintenance free. The floor drain trap guard stops fruit flies and cockroaches from escaping, keeps bacteria, nasty smells, and gases in the drain, and prevents the need to add primers and fresh water to the drain. The waterless trap seal has a patented 3-part design that allows fluid to flow down, but nothing to come back up. The FB-TS35 black floor drain trap fits 3.5” drains.