Exhibit 21.1

LIST OF SUBSIDIARIES

Universal Compression, Inc. is a direct wholly-owned subsidiary of Universal Compression Holdings, Inc. and the following companies are subsidiaries
of Universal Compression, Inc. and, indirectly, of Universal Compression Holdings, Inc.:

|Company                                                  |  | Jurisdiction of
Incorporation/Organization
|-------------------------------------------------------- |  | ------------------------------------------
|Universal Compression International, Inc.                |  | Delaware                                  
|Universal Compression International, Ltd.                |  | Cayman                                    
|Universal Compression Finance Company, Ltd.              |  | Cayman                                    
|Universal Compression of Colombia, Ltd.                  |  | Cayman                                    
|Uniwhale, Ltd. (75%)                                     |  | Cayman                                    
|Universal Compression de Venezuela Unicom, C.A.          |  | Venezuela                                 
|Universal Compression Pty., Ltd.                         |  | Western Australia                         
|Universal Compression de Mexico, S.A. de C.V.            |  | Mexico                                    
|Compressor Systems International, Inc.                   |  | Delaware                                  
|G.C.S. Distributing L.L.C.                               |  | Texas                                     
|Gas Compression Finance Corporation                      |  | Michigan                                  
|Gas Compression Realty L.L.C.                            |  | Michigan                                  
|UCO Equipment LLC                                        |  | Texas                                     
|Enterra Compression Investment Company                   |  | Delaware                                  
|ISS Compression, Inc.                                    |  | Texas                                     
|IEW Compression, Inc.                                    |  | Louisiana                                 
|Compression Services de Mexico, S.A. de C.V.             |  | Mexico                                    
|Universal Compression Canada, Ltd.                       |  | Canada                                    
|Universal Compression Company, L.P.                      |  | Delaware                                  
|UCO Compression LLC                                      |  | Delaware                                  
|UCO Compression Holding, L.L.C.                          |  | Delaware                                  
|Universal Compression Services, L.P.                     |  | Delaware                                  
|Uniwhale de Colombia E.U.                                |  | Colombia                                  
|Universal Compression B.V.                               |  | Netherlands                               
|Universal Compression (Australia) Pty. Ltd.              |  | Australia                                 
|Universal Compression (Thailand), Ltd.                   |  | Thailand                                  
|Universal Compression Services de Venezuela, C.A.        |  | Venezuela                                 
|Universal Compression del Peru, S.R.L.                   |  | Peru                                      
|Universal Compression LTDA                               |  | Brazil                                    
|Global Compression International Inc. Sucursal Argentina |  | Argentina                                 
|Universal Compression Argentina S.A.                     |  | Argentina                                 
|Universal LCM, Inc.                                      |  | Louisiana                                 
|LCM Turbo, Inc.                                          |  | Kansas                                    
|Walco, Inc.                                              |  | Louisiana                                 
|Technical Compression Services, Inc.                     |  | Louisiana                                 
|J.D.R., Inc.                                             |  | Louisiana                                 
|Universal KCI, Inc.                                      |  | Oklahoma                                  
|KCI Leasing, Inc.                                        |  | Oklahoma                                  
|KCI Investments, LLC                                     |  | Delaware                                  
|KCI Compression Company, L.P.                            |  | Delaware                                  
|Universal Compression (Ontario), Ltd.                    |  | British Virgin Islands                    
|Universal Compression (Canada) Holdings, Ltd.            |  | Canada                                    

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