I don't collect Duplo so I'm not familiar with a lot of the pieces they have. Here are the four that stump me: duplo bricks duplo brick

  • 4x10x3-ish freight hopper: I searched "duplo hopper" in BrickLink but only got this

  • 2x2 brick with axle(?). The axles are hollow up to the edge of the brick

  • 2x2 blue dome brick with eyes and a clip. The studs are hollow

  • 5x5-ish dome bricks with a 2x2 centre. They have two tiny holes in the bottom, and a groove at the top. Initially I thought they belonged with the tube system pieces because I have several of those, but the circle size is too big for that.

None have dates on them.


2 Answers 2


The yellow piece looks like 40637 Duplo, Brick 2 x 2 with Digger Bucket Arm Holder.

40637 Duplo, Brick 2 x 2 with Digger Bucket Arm Holder


I just found the answers to 75% of my question! I was scrolling BrickLink for "duplo tube" since I have several of those pieces, then found the blue dome with eyes: it's "Duplo Ball Tube Cover Ring Hinged Top with Eyes". It only appears in one set, and attaches to another piece which I don't have, which then connects to the tubes, so that's why I didn't know it related to the tube pieces.

In this set's inventory, I then found two more of my pieces: the green hopper, which is "Duplo Loading Chute with 2 x 4 Base Bricks", and the red/blue inverted domes, which are "Duplo Egg Base". So I was right about the bases relating to the tubes, but they don't actually connect to them, they just sit there.

I haven't identified the yellow axle brick though!

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