Pre Throat Bushing

PFR-Throat bushing for stuffing boxes and flush water management.

This throat bushing with spiral grooves and a special flow geometry reduces flush water usage and prevents solids from entering the stuffing box.

Produced from a high-strength compound that offers excellent running properties and universal chemical resistance, the system uses the displacement and flow orientation around a rotating shaft. In grooves, solids that get between the shaft and bushing, will be collected and expelled by the induced flush stream. It reduces wear on shaft and packing surfaces. As a result, softer wearing packing styles can be used.  


  • O-Rings seal to stuffing box reducing OD leakage

  • Keeps particles away from stuffing box area

  • Reduce friction, which minimizes HP losses via packing drag

  • Packing runs cooler, which supports reduced water flow requirements

  • Centrfes and Stabilises Shaft

  • Minimizes Flush water up to 80% by reducing clearances

  • Reduction of packing rings results in much less compression on gland

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