Dexen millivolt valve (NATURAL GAS). Thermopile only (no thermocouple). Exact replacement for Robertshaw fireplace valve. American Hearth (Empire): R8380. Continental: G-522A / WS725-13. EMPIRE COMFORT SYSTEMS: R8380. Heatilator: 060-500 / 060-500. Heat-N-Glo: 060-500 / 060-500. Lennox: H2299 / H4260 / 9737. Lexington Forge: 75-29-109 / 7529109 / 75-29-109 / 7529109….