Make a One-Way Check Valve Cheap and Simple. Posted: May 26, 2025 | Last updated: May 26, 2025. The science pros at TKOR explain how to make a cheap and simple one-way check valve.

BRIDGETON, New Jersey (WPVI) -- A small device is having a big impact on the quality of life for some emphysema patients. We learn how these tiny one-way valves got a local woman back on her feet. ...