The ProFlex 790 low-headloss in-line rubber duckbill check valve from Proco Products can be used for municipalities, airport runway runoffs, railway washouts, highway flood damage prevention and odor control. Its design provides rapid dispersion of head pressures, and with low cracking pressure prevents upstream flooding. The foldaway design of the inner sleeve allows for a near full port flow, allowing for quick drainage. The design makes it a fit for combined sewer overflows, sanitary sewer overflows and outfalls. 209/943-6088; www.procoproducts.com; Booth 4327.