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The special offer includes:
| Biological septic tank | |
| Model | ECO4 |
| Number of users | 4-6 |
| Dimensions (cm) | |
| Overall height | 1200 |
| Vat height | 1000 |
| Inlet | 900 |
| Outlet | 850 |
| Diameter (cm) | |
| Vat (Ø) | 1120 |
| Inlet pipe (Øi) | 110 |
| Outlet pipe (Øe) | 110 |
| Manhole (Ø xh) | 500x200 |
| Biogas (Ø) | 1" |
| Volume (litres) | |
| Useful | 890 |
| Total | 990 |