Going through 130 lbs. of 5 decades worth of parts and can't ID this one part. Anyone know what it is or where it's from? It appears to be old light gray but may just be really dirty light bley. It is 2x2x1-1/3 tall. Could be missing it's bottom as it doesn't place on studs. Only number on it is 4. enter image description here

  • Hi JohonnyB, and welcome to Bricks! There are some limits on what new users can post to try an cut down on spam posts and that sort of thing. Once you've earned 10 reputation these should be removed. Depending on how you're using the site, uploading images is fairly easy through the image button on the markdown editor - you can either paste it from your clipboard or upload from your computer or a URL - the actual markdown can be a little confusing I'll admit. Commented Jun 21, 2019 at 16:50

1 Answer 1


That's a Technic Engine Piston Square 2 x 2 - Old.

enter image description here

  • 3
    The funny underside is because it's intended to have this part inserted to let you attach an axle as a connecting rod.
    – Mark
    Commented Jun 21, 2019 at 19:48
  • @Henrik - Finally got my accounts merged! Thanks for the help :)
    – JohnnyB
    Commented Aug 24, 2019 at 0:53

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