sealing shower wall whr spout copper pipe comes out

Hi There,

I would really appreciate some suggestion regarding the issue i am facing. The area where copper pipe comes out from shower wall, in order to fix it, i had to slightly increase its size, but now i am little apprehensive as to if it leaks in future, water may start to go and accumulate behind the wall cavity and damage the wall.

I found this repair kit which has 1/2 inch plastic valve which can be stuck to wall, but it still is little smaller than the hole in shower wall. (I have already replaced the broken copper pipe, only part remaining is sealing the wall so water doesn't seep in)

http://www.sears.com/sioux-chief-97...lCmkwL__KlA8xAE2eHEvoaAsZl8P8HAQ&gclsrc=aw.ds

Can anyone suggest some similar product which may be slightly bigger than that size, would greatly appreciate the help.

link of hole is provided, this hole slightly larger than what its shown in the picture : http://m.imgur.com/6FsGiaq

Thanks!

Silicone around it. Some tub spouts you can get a beauty ring to go behind it. Moen has some. I don't know about generic ones though.

You said shower wall. Is this a tubspout you're talking about or a shower head.

Is it coming out of the fiberglass wall , tile or Drywall?

Picture??

i had given the link to the photo it in description. It was tile btw. I used expanding foam there. Seems to have covered up the surface and used a ring around tub spout to cover it.

Thanks for help.