Gas regulator: 1/2" NPT, 1/2 psi maximum inlet pressure (CSA certified), 5 psi maximum inlet pressure (amitrole tested), 3-6" WC (CSA certified) outlet pressure, double diaphragm balanced valve designator. R & RS Series regulators have a double diaphragm balanced valve design that makes it possible to maintain steady outlet pressure control with widely varying inlet pressures. R & RS series regulators are intended for use with both 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.