Gas Thermostat, [ Fdto-1 ] [ Temp Low-550 ] [ Bulb 3/16" x 14-3/4" ] [ Cap 54" ] [ 3/8" Fpt: in (side & Rear )f & H, Out (side & Rear ) E & G ] .290" D-stem, Includes [ Dial A255, # 22-1010 Low-550 ] Kit Includes: 3/16" CCT Tube Adapters, 1/4" Tube Plugs, 3/8" MPT Pipe Plugs, Dial and Gasket.