Flusher locations in Fortnite Chapter 7 Season 1
via polygon.com
Short excerpt below. Read at the original source.
Flushers in Fortnite are port-a-potties that can be found in a ton of locations around the map. While some flushers are just used as hiding spots, there are some flushers that are connected to one another, and, once used, will teleport you to their port-a-potty partner.