| P/N | Qty of metering block | Blockage monitor | A (mm) | B (mm) |
| DFM-6-M | 12 | Visual indicator | 220.2 | 252.2 |
| DFM-5-M | 10 | Visual indicator | 185.5 | 217.5 |
| DFM-4-M | 8 | Visual indicator | 150.8 | 182.8 |
| DFM-3-M | 6 | Visual indicator | 116.1 | 148.1 |
| DFM-2-M | 4 | Visual indicator | 81.4 | 113.4 |
| DFM-1-M | 2 | Visual indicator | 46.7 | 75.7 |
