This isn't quite what one might expect when offered a sewer mapset... rather than lots of narrow passages in which you can barely walk upright (and smells that you are probably glad cannot be reproduced in a PDF!), this depicts an interesting corner of a modern sewer complex including a monitoring station and someone's hideout - well, who'd think of looking for you there?
If you do need sewer tunnels to chase through, however, there are some sections which you can repeat as needs be to create what you require.
The usual choice of plain, hex grid or square grid is offered, along with a 360° panoramic view facility so that you can show your players what their characters see and very large single-sheet versions for those with access to poster-capable printers or who are using a virtual table top, as well as sheets to stick together if you only have a normal printer.
The sewer itself and the surrounding features are almost photorealistic including a nice distinction between walkways and rough sloping surfaces. If you wish to go delving in sewers this product will support your needs for a combat-ready display.