Made of polypropylene and medical grade silicone, One Way Respiratory Valves (No. 97351 and No. 97352) permit gas flow in one direction only and feature molded arrows that indicate flow direction. No. 97351 offers flow from 22 mm ID inlet to 22 mm OD outlet (female to male), while No. 97352 provides flow from 22 mm OD inlet to 22 mm ID outlet (male to female).
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