1+ Thermostat cover  
2+ Washer faced setscrew  
3+ Thermostat  
4+ Thermostat housing O-ring  
5+ Thermostat housing  
6+ .T-piece  
7+ .Water valve  
8+ Washer faced bolt  
9+ Temperature sensor  
10+ Sealing washer  
11+ Temperature transmitter  
12+ Bypass elbow  
13+ Washer faced setscrew  
14+ Hose  
15+ Hose clip  

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.