NAT GAS, 1-1/2" FPT GAS IN/OUT, 1 PSI, 3"-6" WC, NO VENT LIMITER, FOR OUTSIDE USE ONLY. MAXITROL # RV81-1212-0017 4500 CFH Attention: The pipe fittings for this regulator are based on NPT pipe threads - dimensions according ANSI/ASME B1.20.1 standards. Note! Pipe sizes do not refer to any physical dimensions.
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