No.DescriptionPriceQuantity
1+ Washer faced bolt  
2+ Thermostat cover  
3+ Gasket  
4+ Setscrew  
5+ Serrated washer  
6+ Water pipe  
7+ Thermal switch  
8+ Sealing washer  
9+ Temperature transmitter  
10+ Connecting pipe  
11+ Bush  
12+ Water pipe  
13+ .Core plug  
14+ .Connector  
15+ .Copper washer  
16+ Temperature switch  
17+ Washer  
18+ Thermal vacuum valve  
19+ Gasket  
20+ Lifting eye  
21+ Washer faced bolt  

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.