Servers are on the East Coast. PA

Method 1
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Right-click in Steam on Left 4 Dead 2.
Properties
Set Launch Options
+sv_search_key "Nopax"

Every time you launch L4D2 and host a lobby it will try to connect to my servers.


Code:
Method 2
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Enable Developer Console
Type in..
sv_search_key "Nopax"

If you do it this way, you must do it every time you launch L4D2. This way you have the option of using other servers.