Dexen Robershaw propane gas valve with 30% turn down. This valve uses a Thermopile only, note the black wire indicative of that feature. Gas Valves are not returnable.
Below is a cross reference for this part to manufacturers part numbers

Astria (IHP): H5954

Comfort Flame: H5954

Continental: W725-0037

Country Stoves: H5954

Heatilator: 040-501

Heat-N-Glo: 040-501

IHP: H5954

Ironstrike (IHP): H5954 / H5954

Lennox: H5954

Lexington Forge: 51835 / 51835

Majestic / Insta-Flame / Majco: 51835 / 51835

Mendota: 05-02-00239

Monessen: 51835

Montigo (Canadian Heating): RGC1043R

Napoleon: W725-0037 / WS-725-037

Quadrafire: 040-501

Superior (IHP): H5954

Travis Industries (Avalon – Fireplace Xtrordinair – Lopi): 05-02-00239

Vermont Castings: 51835 / 51835 / 51835