| Model | Capacity Litres (Gallons) | External Dimensions Inches / mm | ||||||
| Effective | Maximum | Top Diameter | Bottom Diameter | Height 1 | Height 2 | |||
| N | 70A | RD | 318 (70) | 455 (100) | 37'' | 24'' | 33'' | 38'' | 
| N | 100A | RD | 455 (100) | 682 (150) | 43'' | 30'' | 34'' | 39'' | 
| N | 150A | RD | 682 (150) | 909 (200) | 49'' | 36'' | 33'' | 39'' | 
| N | 200A | RD | 909 (200) | 1137 (250) | 51'' | 38'' | 45'' | 48'' | 
| N | 250A | RD | 1137 (250) | 1365 (300) | 51'' | 37'' | 51'' | 54'' | 
| N | 300A | RD | 1365 (300) | 1820 (400) | 56'' | 43'' | 51'' | 55'' | 
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