1840 3 41/1 Motion is given to the piston, bucket, or plunger-pole of the pump.
1875 E. H. Knight III. 1752/1 (caption) G is a portion of a plunger-pole, showing the coupling of sections.
2002 (Nexis) 1 July 26 In an AC valve, anything that will prevent proper mating of the plunger pole faces..can cause noisy operation.