The special bypass valve is a tool that provides circulation through the pressure difference.It is an ideal tool for use in large angle of inclination and horizontal wells.
| Model | OD | ID | OAL | Upper Connection | Lower Connection |
| mm(inch) | mm (inch) | mm(ft) | |||
| TPF121 | 121(4-3/4) | 25.4(1) | 1270(4.2) | NC38 | 3-1/2REG |
| TPF159 | 159(6-1/4) | 38.1(1-1/2) | 1270(4.2) | NC50 | 4-1/2REG |
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