The primer hose is used to resolve airlock issues in pumps that have either run out of solution or remained unused for an extended period. To restore the flow of solution, follow these steps:
 
1.Fill the solution tank to generate downward pressure.
2.Connect the male quick disconnect to the female end protruding from the machine.
3.Attach the stopper end to your vacuum hose.
4.Activate both the pump and the vacuum to create suction and draw the solution through the pump.