Fratelli Laveggi D20 manway (PDF)
| A | ø 200 | ø 300 | ø 420 | ø 460 | ø 500 | ø 600 | ø 700 | ø 800 | ø 900 | ø 1000 | ø 1200 | ø 1400 | ø 1500 | ø 1600 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| B | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 
| C | 2 | 2 | 2.5 | 2.5 | 2.5 | 2.5 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 
| D | 3 | 4 | 4 | 4 | 4 | 5 | 6 | 8 | 8 | 10 | 10 | 12 | 14 | 16 |