Febco LF850 QT FZ 1 Part of the LF850 Small Series Tactile Paving Specifications Air Precharge 12 PSI Specifications Air Precharge 12 PSI Air Valve Yes Bladder Material Butyl Brand Watts Buy American Act Compliant NO Color Gray Diameter 21 IN EAN 098268219562 Electricity Required No Fuel Gauge No Inlet Connection Size 1 1 4 IN Inlet Connection Size Metric 32 MM Inlet Connection Type Female Threaded Inlet Thread Type NPT Lead Free Not In Scope Liner Material Does Not Apply To Product Maximum Operating Temperature Fahrenheit 220 Maximum Working Pressure PSI 100 Mount Type Free Standing Orientation Vertical Part Number 0066612 Series ETX Stand Included Yes Tank Acceptance 17 This 10 inch lead free double check valve assembly backflow preventer is designed to prevent the reverse flow of contaminated water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements captured springs Ideal for protection in continuous pressure piping applications and at cross connections identified as non health hazards and for contaminants at the service line entrance