1+ Expansion tank  
2+ Pressure cap  
3+ Fluid level sensor  
4+ Expansion hose  
5+ Header tank  
6+ Bleed hose  
7+ Bleed hose  
8+ Cable clip  
9+ Flange nut  
10+ Flange head screw  
11+ Support  
12+ Double pipe clip  
13+ Double pipe clip  
14+ O-ring  

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.