Pneuline Supply offers several different duckbill check valve options. Duckbill check vavles are usually used in the medical industry, for example in situations where backflow is a main concern.
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The QCD Series Luer Check Valves are made of Polycarbonate and have a Silicone duck bill. The low cracking pressure is 0.433 psi, which determines when the component starts to open. The OD sizes are: 5/64 inch, 7/64 inch, and 9/64 inch. Also available with female and male Luer Locks.