The Samsung DG94-05191A Microwave Knob Assembly provides manual control for compatible Samsung microwave oven models. The knob connects to the control mechanism and allows the user to select or adjust the desired setting. Designed for compatible DOP30T840GS models, this replacement assembly provides a proper fit and restores the control area when the original knob is cracked, damaged,... https://www.hnkparts.com/samsung-dg94-05191a-microwave-knob-assembly-dop30t840gs-sts-mode-duel-95529/4-DG94-05191A.html