Duplo Dark Stone Gray Plate 4 x 4 with B-connector without Red Mark (25548 / 65492)

Duplo Dark Stone Gray Plate 4 x 4 with B-connector without Red Mark has been used in at least 3 LEGO sets over the past 8 years, since it was first used in 2016. You can also find this part in at least 2 other colors. It has the design IDs 25548, 65492 which can usually be found molded into the bottom of the part.

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