This controls the mechanism that allows the pneumatic cylinder to push the chair up and down, the color is black.

We sell over 100 different used parts. If you want to figure out what is wrong with your chair, and how to fix it, buy our twenty minute diagnosis via email, text, video or call for $20.00, purchase at this link, https://rcannon8156.mystorefront.online/?l=1&product=10059&action=product

If you are in Florida we might be able to come to your location and repair your chair for you, if you are interested please ask us for a quote, so we can let you know how much it will cost.

Please let us know if you have any questions.

They are pre-owned, show wear, nicks, and discolorations that may need touch up paint but will work on your chair.

This is for five knobs that control the height adjustment and is a genuine OEM piece for the Aeron office furniture line by Herman Miller.

If you want multiple parts we can combine shipping.