Answers.Body: <p>That's a <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?id=1891#T=C" rel="nofollow noreferrer">Technic Engine Piston Square 2 x 2 - Old</a>.</p>
  
  <p><a href="https://i.sstatic.net/TzSAt.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/TzSAt.jpg" alt="enter image description here"></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-06-21T19:48:41.657Z
Answers.Text: The funny underside is because it's intended to have [this part](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3651#T=C) inserted to let you attach an axle as a connecting rod.
Answers.UserDisplayName: Mark
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-08-24T00:53:24.387Z
Answers.Text: @Henrik - Finally got my accounts merged! Thanks for the help :)
Answers.UserDisplayName: JohnnyB
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-06-21T10:56:11.877Z
Answers.LastActivityDate: 2019-08-24T00:58:49.553Z
Answers.LastEditDate: 2019-08-24T00:58:49.553Z
Answers.UserDisplayName: Henrik supports the community
Body: <p>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.
  <img src="https://i.sstatic.net/cRUnE.jpg" alt="enter image description here"></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-06-21T16:50:37.777Z
Comments.Text: Hi JohonnyB, and welcome to Bricks! There are some [limits on what new users can post](https://bricks.stackexchange.com/help/privileges/new-user) 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.
Comments.UserDisplayName: Zhaph - Ben Duguid
Tags: <part-identification>
Title: Brick or set ID for part?
UserDisplayName: JohnnyB
ThreadText: # Brick or set ID for part?
  
  (Asked by: username_0 on 2019-06-21)
  
  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](https://i.sstatic.net/cRUnE.jpg)
  
  **Tags:** part-identification
  
  > **Comments:**
  > **username_1**: Hi JohonnyB, and welcome to Bricks! There are some [limits on what new users can post](https://bricks.stackexchange.com/help/privileges/new-user) 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.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2019-06-21. Score: 11 | Accepted answer
  
  That's a [Technic Engine Piston Square 2 x 2 - Old](https://www.bricklink.com/v2/catalog/catalogitem.page?id=1891#T=C).
  
  [![enter image description here](https://i.sstatic.net/TzSAt.jpg)](https://i.sstatic.net/TzSAt.jpg)
  
  > **Comments:**
  > **username_3**: The funny underside is because it's intended to have [this part](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3651#T=C) inserted to let you attach an axle as a connecting rod.  
  > **username_0**: @username_2 - Finally got my accounts merged! Thanks for the help :)  
  
  ---
  
  