Why are there 3 different floor sink grates?
The floor sink could be located in the middle of a floor or under a fixture. In either location; a full grate could be used to allow water to flow freely into the drain and help stop garbage from entering the drain and creating a blockage. The full grate will also allow for general foot traffic without tripping hazards. When under a fixture, you may have one or more drains draining into the floor sink. This is where the half and three quarter grates are used to accommodate an opening necessary to receive the incoming drain pipes, while providing some protection against garbage flowing into the floor sink.