The PKX X3161 Square/Rectangular HDPE Flap Gate is a high-performance, one-way HDPE flap valve designed for surface water drainage systems connected to rivers, estuaries, and seawater outfalls.
Engineered for gravity flow applications, it operates effectively under very low hydraulic heads and within ambient temperature ranges from -65°C to +85°C. The valve features a counter-weighted flap mechanism that allows forward flow and reliably prevents backflow—protecting low-lying areas from stormwater surges or tidal intrusion caused by elevated river or seawater levels