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The 40 mil thick liner is more flexible and conforms easier to the shape of the ditch while the 60 mil thick liner provides additional puncture resistance but at the cost of being slightly less flexible
ZN400N-4IC
The pressure setting is 110 psi (758 kPa)
The Watts FD-320 is a high-end area drain designed for commercial environments requiring heavy-duty drainage performance
Watts LF909-QT-HW 1 - Part of the LF909 Small Series Woven Fabric The 40 mil thick linerThis 1 inch lead free reduced pressure zone backflow preventer assembly with its exclusive design incorporating the patented air in and water out principle for protection during an emergency condition prevents the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. Its compact modular design facilitates easy maintenance
