Old Man Pipe Wrench was a Doozer, mentioned on Fraggle Rock. A well-remembered figure from the "first days" of Doozer history, Old Man Pipe Wrench tended to cross boundaries. In "All Work and No Play," the Architect recalls that Pipe Wrench refused to take the helmet. He was also the last known Doozer to actually take credit for his work, which he had to give back, prior to the events in "The Doozer Contest."