Built-in one-way flap valve allows exhalation only. By not allowing inhalation, cross contamination is prevented.
Nominal size: 30.4 mm (1-3/16") OD, same size as # 1025.
Box of 100 in dispenser box (Shown above left).
Box of 250 in bulk 250 box.
Optional reusable, refillable dispenser box (Shown above right) available free with purchase of 5 boxes of 250 or 1 bulkbox, just ask for ZMPBOX.
Last Updated: 7 Jan 2016