The Honeywell VS8520E2092/B Central Boiler Fireplace Gas Valve is a compact millivolt gas control designed to regulate fuel flow in compatible gas-fired heating appliances. Powered by a 750 mV thermopile and 30 mV thermocouple, it controls gas delivery to the burner while supporting safe pilot operation and flame control. Suitable for gas fireplaces, fireplace inserts, log sets, wall ... https://www.partshnc.com/vs8520e2092-b-honeywell-fireplace-gas-valve-central-boiler