1+ Oil separator breather  
2+ Breather elbow  
3+ Breather pipe  
4+ Breather pipe  
5+ Hose band  
6+ Special pipe clip  
7+ Star washer  
8+ T-piece  
9+ Pipe cap  
10+ Purge hose  
11+ Purge hose  
12+ Sealing washer  

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.