Winco Stainless Steel Adapter Plate For Soup Inserts – Various Sizes. Available in multiple configurations, these adapter plates are to be used as a guide with our full size (or larger) bain marie electric warmers. Features & Specifications: Made to fit our Winco inserts and covers Fits all full size (or larger) bain maries Adapter plates fit 11 Qt, 7 Qt, 4 Qt, and 2.5 Qt cylinder inserts and covers Plate measures 21 1/8″ x 13 3/16″ to fit a full size bain marie