Watts RK 770 CK4 8 Part of the RK 770 Series Z100F 8NH ZN415S 4IP ZN415S 4IP Specifications Air Precharge 12 PSI Air Valve Yes Bladder Material Butyl Brand Watts Buy American Act Compliant NO Color Gray Diameter 21 IN EAN 098268219593 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 0066613 Series ETX Stand Included Yes Tank Acceptance 24 No special tools required for changing parts All parts are made of high quality materials