Anselmo Cola TERMOPLUS 18 Manuel D'installation, D'utilisation Et De Maintenance page 53

6.5 Plumbing components
Key:
1 - Membrane expansion tank
2 - System drain cock
3 - Safety valve
4 - System filling connection
5 - Circulating pump
6 - Return pipe
7 - Pressure transducer
8 - Expansion tank connection
9 - Air venting valve
10- Delivery pipe
53 TERMOPLUS 18