Robertshaw 4B57414C6A Natural Gas Millivolt Valve 1/2" X 1/2" 4" WC

The Robertshaw 4B57414C6A Natural Gas Milli-volt Valve WC is a gas flow-control component that regulates the delivery of natural gas to the burner in millivolt operated heating equipment. Commonly used in unit heaters, furnaces and fireplaces in HVAC systems it support dependable burner ignition, stable flame, controlled fuel distribution and consistent heating performance. It responds to signals generated by a thermopile, closing and opening the gas supply without requiring an external power source while maintaining a regulated 4-inch water column outlet pressure. Designed with 1/2-inch inlet and outlet connections, it installs directly within the gas train.