Dome Valves and Cross Slit Valves with Back-up Seal, How They Work (patent pending) - Minivalve
10 pieces Transparent Silicone Duckbill Valve One-way Check Valve 11 x 6.2 x 16.6 MM for Liquid and Gas Backflow Prevent: Amazon.com: Industrial & Scientific
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Flanged Duck Bill Check Valve
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