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Amazon.com : Natural Gas Pressure Regulator with 3/4" FNPT Thread, 1/2 PSIG Inlet Pressure and 4" &10" WC Outlet For Grill, NG Regulator for Standby Generator, Construction Heaters, Stove Range Pipe Lines :
Maxitrol 325-L Series 3/4" Regulator 325-5L600-3/4