looks like pin or ball lock but not sure but they are cheap
http://cgi.ebay.com/Corny-Kegs-With...ryZ38172QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
http://cgi.ebay.com/Corny-Kegs-With...ryZ38172QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
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