This is an Original Thermo King part for type Unit:
CD MAX & CD MAX EEC           
CD-II MAX & CD-II MAX EEC     
JD-II met TK2'4'9 Engine      
MD-200 MT                     
MD-II MAX met TK3'7'4 Engine  
MD-II TCI met TK3'7'4         
MD-II TLE met TK3'7'4 Engine  
MD-MT                         
RDB-II                        
RD-II MAX met TK3'9'5
RD-II met TK3'9'5
RD-II TCI met TK3'9'5 Engine  
RD-II TCI-Z EEC met TK3'9'5   
RD-II TLE                     
RD-MT                         
Super TD-II met TK3'9'5 Engine
TCI EEC met TK3'7'4           
TCI-Z EEC met TK3'7'4         
TD-II MAX met TK3'9'5
TD-II met TK3'9'5
ThermoKing Part Description:
TESTER - cab control box
Thermo-King no. 204-0831
Description on Article: 
Thermo King
Dual
Din-Cab
Tester
Single
Description on packing: 
Thermo King
204-831
Tester In/Cab Box D1
Examples and applications or 
Names and unit codes: 
TK204-831 / TK-204831 / TK.204.831 / TK204831
TK204-0831 / TK-2040831 / TK.204.0831 / TK2040831
MD200MT / MD 200 MT                                                                                                                                         
SuperTDII / Super TD II / Super-TD-II / SuperTD2 / Super TD 2 / Super-TD-2                                                                                  
RDIITLE / RD II TLE / RD-II-TLE / RD2TLE / RD 2 TLE / RD-2-TLE                                                                                              
RDIITCI / RD II TCI / RD-II-TCI / RD2TCI / RD 2 TCI / RD-2-TCI                                                                                              
Hattink Heesch.comCDIIMAX / CD II MAX / CD-II-MAX / CD2MAX / CD 2 MAX / CD-2-MAX / CDIIMAXEEC / CD II MAX EEC / CD-II-MAX-EEC / CD2MAXEEC / CD 2 MAX EEC / CD-2-MAX-EEC       
TDIIMAX / TD II MAX / TD-II-MAX / TD2MAX / TD 2 MAX / TD-2-MAX   
TCIZEEC/TC1ZEEC                                                                                                                                             
MD2TCI/MD-2TCI/MDIITCI                                                                                                                                      
MDMT / MD MT                                                                                                                                                
TCIEEC/TC1EEC                                                                                                                                               
MDIIMAX / MD II MAX / MD-II-MAX / MD2MAX / MD 2 MAX / MD-2-MAX                                                                                              
TDII / TD II / TD2 / TD 2 /TD-2   
JDII / JD II / JD2 / JD 2 / JD-2                                                                                                                            
RDMT / RD MT                                                                                                                                                
CDMAX / CDMAXEEC                                                                                                                                            
RD2TCIZEEC/RDII                                                                                                                                             
MDII / MD II / MD2 / MD 2 / MD-2 TK374 Engine
RDBII / RDB II / RDB2 / RDB 2 / RDB-2                                                                                                                       
Inlet pressure Regulator / VALVE throttling / throttlingvalve / throttling valve / Suction Regulator / Regulator Suction / Pressure Valve Regulator / pressure Regulator Inlet / pressure Inlet Regulator  / Valve Pressure Regulator / RegulatorSuction /