| Model L The Johnson-Fagg Model L Stuffing Box is a dual packing stuffing box with a unique method of closing the lower packing to hold back well pressure during replacement of the upper packing. The upper packing is a standard, interchangeable industry design while the lower packing is a special full circle rubber "H" packing that is closed by application of pressure through the use of a standard grease gun. Pressure from the grease gun is applied to the lower "H" packing to seal off the well pressure, then after the upper packing is replaced, the lower "H" packing pressure is released by pushing on the pressure relief valve with a pocketknife or screwdriver. The "H" packing automatically retracts and the well can be restarted. |
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