What Is This Object Under Hood of 87 C30?

About one year ago I bought an 87 C30.
As a preliminary question, what is the copper-colored object in the center of this picture? Seems like it must be a filter. Is it? Does it unscrew? Is it at
all likely to completely block flow?
http://www.geocities.com/ecarecar/picture052.jpg
About 83k.
Al Smith
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This is the pressure accumulator for the hydro boost power brake system, do not "f" with it.

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I agree.
Shep wrote:

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