Nilfisk-Advance P 150.1-10 B Repair Manual page 12

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Dismounting / Mounting of Easy start valve.
Remove the easy seat with a small hook (fig.1) then remove the
o-ring underneath the seat ,with a small screwdriver .
Mounting : place the ball on the end of the spring (fig.2), be sure
the the ball are in the right position when mounting plug.
Service / Repair.
Fig.1
Fig.1
Regarding the mark on the seat,
See section "Operation guide"
2.5 Handle release
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Fig.2
D