Grand Order of Plumbers

The Grand Order of Plumbers is an organization apparently dedicated to plumbing from The Super Mario Bros. Super Show!.

The only mentioning of of the Grand Order of Plumbers was in The Super Mario Bros. Super Show! episode "The Adventures of Sherlock Mario / Plumbers of the Year", in which the Grand Order of Plumbers sent the Imperial Poobah to grant Mario and Luigi the status of Plumbers of the Year.