Hale HP Series - Manual (Page 17)

USER OPERATION AND MAINTENANCE
HP SERIES
PORTABLE PUMPS
17
1/4 TURN BALL VALVE
(SHOWN IN NORMAL
OPERATING POSITION)
EXHAUST PRIMER
VALVE ASSEMBLY
EXHAUST PRIMER ASSEMBLY
operated with a positive pressure
source the valve must be closed to
prevent water from being blown out
of the exhaust pipe.