Модификации
| Ordering Number | Tube O.D. |
| MPT-6M | 6 mm |
| MPT-8M | 8 mm |
| MPT-10M | 10 mm |
| MPT-12M | 12 mm |
| MPT-14M | 14 mm |
| MPT-15M | 15 mm |
| MPT-16M | 16 mm |
| MPT-18M | 18 mm |
| MPT-20M | 20 mm |
| MPT-22M | 22 mm |
| MPT-25M | 25 mm |