What is this?? Please help

I’ve got air leaking thru my gx cs2 pump from the gauge area. There’s a gasket that goes there by I notice the brown part here isn’t in my guage. 1 how do I get that piece or am I going to need a new gauge?

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That appears to be an integral snubber. It’s tiny pieces of (I think) sintered bronze packed in a cylindrical area. It dlows air down so that it doesn’t slam/shock the bourdon tube in your gage. They also act as a filter.
The photo is an example of a replaceable snubber insert.


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