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3/8" regulator 1/2 psi CSA. R & RS Series regulators have a double diaphragm balanced valve design that maintains steady outlet pressure control with widely varying inlet pressures. R & RS series regulators are intended for main burner and pilot load applications. Applications include infrared heaters and pilot lines on large industrial heaters and boilers. They may also be used in residential applications as appliance regulators. Suitable for natural, manufactured, mixed gases, liquefied petroleum gases, LP gas-air mixtures, and DIN EN 437 gas families 1, 2, and 3.