2001 Oldsmobile Silhouette Water pipe connection

Attached is a picture of a water pipe connection. How do I open this connection? This line runs from the front right of the block, across the valve cover, under the throttle and rhen to the fire wall. Is there a trick in opening this connectiion?[img:660a06313e]http://www.2carpros.com/forum/automotive_pictures/566589_IMG_4540_2.jpg[/img:660a06313e][img:660a06313e]http://www.2carpros.com/forum/automotive_pictures/566589_IMG_4541_2.jpg[/img:660a06313e]