This diagram details the gas supply connection to a boiler, starting from the main gas line with a six-inch minimum drip leg. The branch line includes a manual shutoff valve, a pressure regulator, a strainer, and a pipe union ahead of the point of connection to the boiler. Inside the boiler enclosure, the line connects through a second shutoff valve and a motorized valve to the internal burner supply. All components are arranged sequentially to maintain proper pressure control, sediment collection, and isolation capabilities.
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