From publisher blurb:
If you're mapping endless sewers, sometimes you just need some simple tunnels and passages. The Sewer Tunnels set is exactly what you want!
The Dungeons in Blue series brings classic blue maps to the virtual tabletop! These ready-to-fill maps are packed with rooms, corridors, pits, and caves; all judiciously sprinkled with tricks and traps. Every geomorph tile seamlessly connects to every other tile in the series, providing the megadungeon builder tremendous freedom and flexibility.
This product includes sixteen unique map tiles rendered at 100px per five-foot square. This set depicts simple sewer tunnels with only minor features. Nothing hidden here, so there are no GM versions of these tiles. This set includes (ST1-ST16):
Four 50x50 foot tiles.
Eight 50x100 foot tiles.
Four 100x100 foot tiles.
A map legend image detailing all map markup.
A one-third scale summary map showing all tiles.
A short readme PDF.
All maps are ready-to-use PNG-format files compatible with most virtual tabletops. Use them as-is, or combine them into larger maps using your favorite image processing software.