When you can hear air leaking (escaping) from the duckbill valve, it may be wearing out.  

  • Is it tacky?  
  • When you press the ends together does it open easily?   
  • Is it seated firmly in the adapter?  

They’re pretty inexpensive to replace, so it might be worth trying a new one to see if it helps.

Reviewed by Diana West, IBCLC

June 10, 2021