Max's Plumbing is a local shop owned by Max Tennyson in Omniverse. It is also the secret entrance to the Plumber Headquarters underneath Bellwood. To enter the base, one must enter the restroom and pull down the chain that normally flushed the toilet. A hidden elevator then sends the person down to Plumber HQ.
The secret entrance has the appearance of a non-working toilet and there's always an out-of-order sign on the restroom door to keep regular people from discovering the hidden elevator. Ironically, in Bengeance Is Mine, Bill Gacks, a normal human plumber, actually fixed the broken toilet.
The shop is no longer in active use since the Plumber Headquarters was moved to space. People can move between Earth and the base through teleportation.
Ben 10: Omniverse
- The More Things Change: Part 1 (first appearance)
- Trouble Helix
- The Frogs of War: Part 1
- The Frogs of War: Part 2
- O Mother, Where Art Thou?
- Bengeance Is Mine
- The Rooters of All Evil (image on the computer)
- The Final Countdown (destroyed)
- It appears in Alien Unlock 2.