Gas water controlsshut off main and pilot gas when pilot fails. Feature single-cycle energy cutoff e. O. And high-limit switch. 4e121 is aga and csa certified; 2e704 is aga certified. Inlet 1/2in npt; outlet 1/2in inverted flarewater control, gas type natural, temperature range 60 to 160 degrees fahrenheit, capacity 45000 btuh, pressure regulation main burner 4 inches wc, sensing element 5 1/2 inches, shank length 1 3/8 inches, pilot fixed.
Robertshaw Natural Gas Water Thermostat, 1.375-Inch Shank,