LEGO Medium Blue Technic Connector Block 4 x 4 x 2 (44137)

LEGO Medium Blue Technic Connector Block 4 x 4 x 2 has been used in at least 4 LEGO sets over the past 21 years, since it was first used in 2003. You can also find this part in at least 5 other colors. It has a design ID of 44137 which can usually be found molded into the bottom of the part.

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