The manometer tube is enclosed in a round-bottom, graduated jacket and is sealed to a stopcock plug, that vents the outer jacket through a side tube in neck. Mercury is placed in the inner tube and in jacket bottom to measure the pressure differential.
Not recommended for positive pressure.
Red scale ranges from 0 to 160mm.
With ST/NS: stopper. 235 × 25mm O.D.
Mercury not included.
Mercury-filling instructions are supplied with each manometer.