Exhibit 21.1 Subsidiaries of the Registrant 1) XSMC, Inc. (formerly known as Southern Manufacturing Company) 100% - Owned Subsidiary Incorporated in the State of Florida 2) Carolina Pump & Supply Corp. d/b/a - Pump & Lighting Company 100% - Owned Subsidiary Incorporated in the State of North Carolina 3) USCO Incorporated 100% - Owned Subsidiary Incorporated in the State of North Carolina 4) Paine Supply of Jackson, Inc. 100% - Owned Subsidiary Incorporated in the State of Mississippi 5) Hughes Aviation, Inc. 100% - Owned Subsidiary Incorporated in the State of Florida 6) One Stop Supply, Inc. 100% - Owned Subsidiary Incorporated in the State of Tennessee 7) Mills & Lupton Supply Company 100% - Owned Subsidiary Incorporated in the State of Tennessee 8) Twin-T of the Carolinas, Inc. 100% - Owned Subsidiary Incorporated in the State of North Carolina 9) H Venture Corp. 100% - Owned Subsidiary Incorporated in the State of Florida 10) HHH, Inc. 100% - Owned Subsidiary Incorporated in the State of Delaware 11) HSI Corp. 100% - Owned Subsidiary Incorporated in the State of Delaware 12) Electrical Distributors, Inc. 100% - Owned Subsidiary Incorporated in the State of Georgia 13) Alabama Water Works Supply, Inc. 100% - Owned Subsidiary Incorporated in the State of Alabama 14) Swaim Supply Company, Inc. 100% - Owned Subsidiary Incorporated in the State of North Carolina