Replacing master cylinder

[Cskaggs2]

I am replacing my master cylinder. When I took apart the old one, I found this part inside one of the ports. The new one did not come with it so I assume it needs to be swapped. Issue is the part from the old one is cracked. Any ideas if I can get a replacement part?

 

[Noiseydiesel]

external port?

 

[IDIBRONCO]

Do you have a picture of the part?

 

[Cskaggs2]

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Sorry, thought I posted the picture on the original post.

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