20 GPM MAX UNIVERSAL FLOW RELIEF CARTRIDGE.
FOUR-WAY SOLENOID HIGH-FLOW DIRECTIONAL VALVE WITH TWO POSITONS. NFPA 1.
FOUR-WAY SOLENOID HIGH-FLOW DIRECTIONAL VALVE WITH THREE POSITONS. NFPA 2.
CHECK VALVE, 5 PSI CRACKLING PRESSURE, 18 GPM. Flat-faced with 1/2 " NPT.