Valve Series: 36G, Fuel Type: Natural Gas, Capacity (BTU/HR @ 1 in. W.C. Pressure Drop): 140,000, Ignition System: Hot Surface/Direct Spark, No. of Stages: 2, Input Fitting Size NPT (in.): 1/2, Output Fitting Size NPT (in.): 1/2, Valve Body Length (in.): 4, Valve Body Width (in.): 2-7/16, Valve Body Height (in.): 4-1/4, LP Spring Kit: 60-21193-06, Natural Gas Spring Kit: 607018, LP Conversion Kit Included: No