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When determining the level of a potable water hydro pneumatic header tank fitted with a tubular sight glass, what must be taken into consideration?
A) The sight glass must be drained, blown down, and re-filled before each reading is taken.
B) The actual water level in the hydro pneumatic header tank is somewhat higher than the level shown in the sight glass.
C) The actual water level in the hydro pneumatic header tank is somewhat lower than the level shown in the sight glass.
D) The actual water level in the hydro pneumatic header tank is identical to the level shown in the sight glass.
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