Cheaper aftermarket part
Three-output adapter listed for 55026
Low-voltage DC. Department 56 lists 2.5V 500mA. Barrel size and polarity aren't confirmed.
Replacement adapters are sold by this number, but no plain generic has a confirmed plug.
Check first: Read the volts on your battery box sticker or old adapter. Sellers split between 2.5V and 3V, so buy what the label says. Match the polarity symbol on your old adapter.
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