1+ Thermostat cover  
2+ Washer faced setscrew  
3+ Gasket  
4+ Thermostat  
5+ Thermostat housing  
6+ .Water valve  
7+ .T-piece  
8+ Thermostat housing/cylinder head gasket  
9+ Washer faced bolt  
10+ Temperature sensor  
11+ Sealing washer  
12+ Temperature transmitter  
13+ Bypass elbow  
14+ Flange head screw  

The part numbers in the assembly image below relate to the product number in the table. Clicking on the part number will open up the relevant part details.