Rinnai PA-KIT E (NG) A Series Gas Control Assembly - (PA-KIT E (NG)) The PA-KIT E (NG) is the genuine Rinnai gas control assembly for the A Series Infinity, specific to Natural Gas installations. It bundles the main solenoid valve, the changeover solenoid valves, and the modulating valve into a single assembly. The main solenoid stays open as long as there's flow through the unit, while the modulating valve and changeover solenoids manage the gas flow rate to keep water temperature stable regardless of demand or flow rate. The valve is electronically controlled and factory set, so no adjustment is normally needed during installation — unless the unit isn't performing correctly and every other cause has been ruled out. After fitting this assembly, gas pressure needs verifying and setting at the burner test point, following Rinnai's commissioning pro