Williams Comfort Products P322660 10 Inch WC LP 1/2 Inch Gas Valve is a gas flow control component designed to regulate propane delivery in compatible heating systems. It works by opening and closing in response to thermostat and control signals, maintaining a manifold pressure of 10 inches water column for safe, consistent burner operation. https://www.partshnc.com/p322660-williams-comfort-products-10-wc-lp-12-gas-valve