One-Way Valve Mouthpieces - Box/200

The low cost, low resistance SafeTway® mouthpiece allows entry of expired air into the measuring system, but not back to the test subject.
This simple, yet effective patented design prevents concerns of accidental inhalation of pathogens.
The SafeTway is an inexpensive alternative to the bacterial viral filter for expiratory only testing.
inner Ø 27mm
outer Ø 30mm
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