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A pressure regulator is a valve that will cut off the flow of liquid or gas when it reaches a certain pressure.
This band screw is sold individually.
Burner valves are attached to the main gas line. When the switch is turned the gas then flows into a tube that mixes with air, creating the appropriate mixture for ignition.
This is the nut that has a hole in the center and is attached to the drain tube that leads the grease/oil from the grill pan.