This is an Original Thermo King part for type Unit:
KD-I                          
KD-II
KD-II MAX met TK3'6'6 Engine
LND 30 & 50                   
LND 30 PEG                    
McTRK-I 30 TC                 
McTRK-I 50 TC                 
MD-I                          
MD-I SSIV                     
MD-II & MD-II MAX             
MD-II TCI
MD-II TCI-Z                   
RD-I SSIV
RD-I TC                       
RD-I TCIA EEC                 
SDZ 30 & 50 EEC               
TD-I                          
TK235 Engine                  
UMD 20DG                      
URD 25DG                      
URD 50 TCIA                   
ThermoKing Part Description:
PIN - dowel
Thermo-King no. 55-4599
Description on packing: 
55-4599
Pin
Made in Japan
Examples and applications or 
Names and unit codes: 
TK55-4599 / TK-554599 / TK.55.4599 / TK554599
McTRKI50TC / McTRK I 50 TC / McTRK-I-50-TC / McTRK150TC / McTRK 1 50 TC / McTRK-1-50-TC                                                                     
URD25DG / URD 25 DG                                                                                                                                         
KDII / KD II / KD2 / KD 2 / KD-2
MDISSIV / MD I SSIV / MD-I-SSIV / MD1SSIV / MD 1 SSIV / MD-1-SSIV                                                                                           
MDIITCI
TDI / TD I / TD1 / TD 1 / TD-1                                                                                                                              
CuijkHattinkMDI / MD I / MD1 / MD 1 / MD-1                                                                                                                              
HattinkThermo-PartsSDZ30EEC / SDZ 30 EEC / SDZ-30-EEC / SDZ50EEC / SDZ 50 EEC / SDZ-50-EEC                                                                                     
RDITCIAEEC / RD I TCIA EEC / RD-I-TCIA-EEC / RD1TCIAEEC / RD 1 TCIA EEC / RD-1-TCIA-EEC                                                                     
CuijkHattinkKDI / KD I / KD1 / KD 1 / KD-1                                                                                                                              
MDIITCIZ / MD II TCI Z / MD-II-TCI-Z / MD2TCIZ / MD 2 TCI Z / MD-2-TCI-Z                                                                                    
MDII / MD II / MDIIMAX / MD II MAX / MD-II-MAX                                                                                                              
RDITC / RD I TC / RD-I-TC / RD1TC / RD 1 TC / RD-1-TC                                                                                                       
MD2TCi
URD50TCIA / URD-50-TCIA                                                                                                                                     
HattinkThermo-Parts.ComLND30 / LND-30 / LND50 / LND-50                                                                                                                             
RD I
RDISSIV
MD-2TCI
LND30PEG / LND-30-PEG                                                                                                                                       
UMD20DG / UMD 20 DG                                                                                                                                         
McTRKI30TC / McTRK I 30 TC / McTRK-I-30-TC / McTRK130TC / McTRK 1 30 TC / McTRK-1-30-TC                                                                     
KDIIMAX / KD II MAX / KD-II-MAX / KD2MAX / KD 2 MAX / KD-2-MAX
Pressure Valve Regulator / throttlingvalve / throttling valve / Suction Regulator / RegulatorSuction / Regulator Suction / Inlet pressure Regulator / pressure Regulator Inlet / Valve Pressure Regulator / pressure Inlet Regulator  / VALVE throttling /