Allpoints 51-1200 3 1/2" WC Natural Gas Operator - 250 MV to 750 MV

replacement operator, nat gas, 3.5" wc, millivolt for 700 series gas valves except bleed gas types. model mvr, mfg # 705-502, color gray or red block with gasket and screws 250 mv to 750 mv.