Pulse Xyleject Operator's Manual page 25

Insert the Medicine Piston into the housing.
Remove the spring. The Medicine
Piston is easily removed by hand.
Remove the existing black O-ring with tweezers or
other tool. Do not remove or damage the white
rings on the Medicine Piston. Push the new black
O-ring on with your fingers and wet with water
before re-installing the Medicine Piston.
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