| Two Stage Hollow Valve Rod Pump |
| This is a rugged pump which overcomes most gas locking conditions and has the ability to produce a moderate quantity of sand or other particulates. |
| Sliding Top Valve |
| The Harbison-Fischer Top Valve is an elegant solution to the problem of gas locking and is helpful in fluid pound conditions. |
| Loc-No® Plunger |
| The Harbison-Fischer Loc-No® Plunger was designed to provide a mechanically opening traveling valve in order to overcome the need for high compression in the pump compression chamber. |
| Travel No-Loc Valve |
| This device gives the Traveling Barrel Pump and opportunity to work without gas locking while retaining all f the advantages of a common Traveling Barrel Pump. |
| Gas Chaser Pump |
| This pump is designed for the very worst gas locking problems that are encountered in rod pumped wells. |
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