From the Super Mario Wiki
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The Pipe Yard is one of the places found in Bowser's body during the events of Mario & Luigi: Bowser's Inside Story, that is apparently located in Bowser's ear. There are many different pipes in this area that connect to locations all over the Mushroom Kingdom, such as Dimble Wood, the Toad Town Caves, and Bowser's Castle. As the game continues on, Mario and Luigi learn new moves and can reach more pipes that were not accessible before. In parts of the game, players need to head to the Pipe Yard to leave Bowser's body. The Red Pipe falls only after Bowser gets electrocuted.
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