Genuine LiftMaster K41-0372-000 20-tooth #41 drive sprocket for the Maxum industrial DC operators.
Fitment: LiftMaster Maxum TDC12.
The TDC 700 runs #48 chain and takes K41-0373-000 instead.
Ordering the right part depends on the full model number, which is printed on the operator label. Call GateHouse Supplies if you are not sure — we service these units every day.