3.2L V6 Valve Cover Gasket Replacement

[K-man]

2006 Base model

 

In December when I changed spark plugs and ignition coils, there was oil on both. I figured I'd go ahead and replace the valve cover gasket and spark plug gaskets. Now that the parts have arrived, I'm ready to tackle the project. Instructions are from ALLDATAdiy.com. I'm attempting to remove the intake manifold to gain access to the cylinder head cover. Their diagram on the left side of the attachment shows an Item #3 that needs to be disconnected. To me, it looks like the item in the picture on the right. (This line seems to go around the back of the engine to the driver's side and terminates somewhere near the brake booster.) I tried several different ways to get this to detach, but only succeeded in cracking the white plastic collar. Two questions: is this the part in the diagram AND, if so, how does it detach?

[GKARAG@BELLSOUTH.NET]

Squeeze the sides and pull. Be ready to buy another one if it has any age on it since it probably will crack.