Alabama Tank, Inc.
Brown-Minneapolis Tank - NW, LLC
Certified Tank & Manufacturing LLC
Clawson Tank Co.
Derson Manufacturing, Inc. 
Dragon Products - LaPorte, TX 
Eaton Sales & Service, LLC  
General Industries, Inc.  
George I. Reitz & Sons, Inc.
Greer Steel - Lakewood, WA
Greer Tank, Inc. Anchorage, AK
Hall Tank Company
Hamilton Welding Co.
Highland Tank & Mfg. Co. Manheim, PA
Highland Tank & Mfg. Co. Greensboro, NC
Highland Tank of New York
Kohlhaas Corp.
Lannon Tank Corp.
Mid-South Steel Products, Inc.
Modern Welding Co. of Iowa Inc.
Modern Welding Co. of Ohio Inc.
Modern Welding Co. of Georgia Inc.
Modern Welding Co. of Florida Inc.
Modern Welding Co. of Texas Inc. - Houston
Modern Welding Co. of Texas Inc. - Rhome
Newberry Tanks & Equipment, Inc.
O'Day Tank & Steel LLC.
Rommesmo Companies - Fargo Tank & Steel
Service Welding & Machine Co., Inc.
Southern Tank & Mfg. Specialty Tank & Equipment Co.
Specialty Tank & Mfg.
Stanwade Metal Products
Steel Tank & Fabricating Co., Corp - Columbia City, IN
Steel Tank & Fabricating Co., Inc. - Mancelona, MI 
Watco Tanks, Inc.