First Degree NEPTUNE Challenge AR Owner's Manual page 10

Note on filling the A/R tank:
Please Read before filling
WARNING:
tank:
When filling the A/R tank, the ad-
juster handle must be set to the
Set adjuster knob to "MAX"
"MAX" position as shown to allow
prior to filling
accurate fill levels.
Using any other setting other than
max will result in inaccurate fill
levels and in extreme cases could
cause leakage to occur during
use or when stored in the stand-
ing position.
Do not exceed the max 17 liter
level as shown on the tank decal
sticker.