The General Electric WB21X21506 Range Valve Control Assembly Nor. D is a replacement component designed to regulate the flow of gas to a designated burner during cooking. It operates by responding to the rotation of the corresponding control knob, adjusting the internal valve position to regulate the amount of gas supplied to the burner. This valve control assembly is used when the ex... https://www.hnkparts.com/wb21x21506-general-electric-valve-control-asm-nor-d