1+ Balance pipe  
2+ Water bypass hose  
3+ Hose  
4+ Hose  
5+ Connector  
6+ Extra air valve  
7+ Gasket  
8+ Screw  
9+ Serrated washer  
10+ Hose clip  
11+ 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.