Simmons 8842 Plunger

Genuine Simmons 8842 Plunger for Simmons models 800, 800LF, 4800, and 5800. The 8842 is consists of a rubber bullet shaped plunger, and a stainless steel inner core. This part threads onto the bottom of the pump rod, and controls the water flow. If your hydrant is leaking out of the spout it is due to the plunger. It would either need to be replaced, or adjusted. Below are the instructions to adjust the plunger! 

SHUT-OFF
ADJUSTMENT:
1. Loosen the square-head set-screw. (If hydrant has a flow lock wheel, loosen it.)
2. Raise the handle to about 90 degrees or to where the handle is parallel to the ground.
3. Tighten the square- 90° head set-screw and close handle.
4. Open hydrant all the way to allow full flow of water. Then shut off flow and hold your finger lightly over the outlet (you should feel slight suction on your finger). If there is no suction or if hydrant leaks from hose adapter, repeat steps.