Genuine LiftMaster K41-0050-000 reset switch with ID resistor for the HDSW24UL heavy-duty swing gate operator.
Fitment: LiftMaster HDSW24UL. The ID resistor tells the main control board which operator it is fitted to, so a plain reset switch will not work in its place. The slide-gate HDSL24UL uses K41-0048-000 instead.
Replace when the operator will not reset after an obstruction, or the board reports the wrong operator type.