0+ (Unillustrated Parts)  
1+ Water rail  
2+ Washer faced setscrew  
3+ Hose  
4+ Worm drive hose clip  
5+ Heater return hose  
6+ Worm drive hose clip  
7+ Hose clip  
8+ Hose support clip  
9+ Water hose  
10+ Worm drive hose clip  
11+ Water pipe  
12+ Setscrew  
13+ Restrictor  
14+ Bolt  
15+ Water heater restrictor gasket  
16+ Hose  
17+ Water rail gasket  

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.