CURT Trailer Hitch Receiver Adapter Reducer Sleeve Set, 3 to 2-1/2 or 2-Inch, 2-Piece Model 45408CURT Trailer Hitch Receiver Adapter Reducer Sleeve Set, 3 to 2 1 2 or 2 Inch, 2 Piece Model 45408 The CURT reducer sleeve set includes two reducer sleeves that adapt a 3" receiver tube opening to fit a 2 1 2" or 2" shank. The adapter sleeves install easily and are compatible with virtually any 3" hitch. The smaller sleeve can also be used in a 2 1 2" receiver tube opening, adapting it for a 2" shank. The gross trailer weight capacity and tongue weight