Water gets inside flue pipe from the cap, need help

I have a water problem since I stopped using the pellet stove last year.
Everytime theres nasty weather outside water finds its way inside the flue pipe and ends up at the bottom of the Tcap.
With particular on long rainy days I have to empty the tcap several times.
I have checked the pipe and there are no holes, the water is coming from the cap.
I have replaced it with this cap
http://www.hardwareandtools.com/Sel...-Pipe-3-Inch-Pellet-Vertical-Cap-6266654.html

thinking that it would help but it made no difference.
Before this was the cap I had :
http://www.homehardware.ca/en/rec/index.htm/_/N-67lZ2pqf/Ne-67n/Ntk-All_EN/R-I5533026?Ntt=pellet

It doesnt help when it rains its usually very windy as well and the pipe goes up the roof several feet so theres no protection against the winds whatsoever.
Besides blocking completely the cap is there anything else I can do to prevent water from getting inside the flue?

Obviously when I had the stove running as my main heating source this was not a problem (never noticed it), but now its used as a secondary heat source I cant have water inside the pipe.

Thanks

My water woes problem continues.

does anyone have any sugestions to prevent water from getting in thru the rain cap?
I have been on the roof and there is nowhere else the water will come in.
I really need help with this. What modification can I do to the cap without comprimising its use?

Thanks fire the suggestion but my installation is vertical not horizontal.

Does anyone have or have seen this :

http://www.icc-rsf.com/main.php?t=chem_produits&i=84&l=e&d=2&

Its the Rain/Wind Shield (PRCW) and thats exactly what I am looking for.

I wonder what the cost is.
I can only find it on that website but theres no pricing info.
My only concern is that it is too big for the vent that I have right now.
The shield is 11 inches and my cap is only 6 inches... I am afraid that the little tabs that are used to screw the shield to the cap are not long enough.

Which leads me to another question, what is the cost of this cap ?
http://www.icc-rsf.com/main.php?t=chem_produits&i=83&l=e&d=2&

I am baffled and I dont know what else to do...

I went ahead and bought the cap and rain shield listed on my previous post and Im still getting water inside the pipe.
I went on the roof yesterday to check if perhaps I didnt install the cap properly into the pipe so I pulled it out and the inside was all wet and I could not see signs of water anywhere on the outside of the pipe or any holes that the water could get in.
So somehow the water gets in thru the cap. I dont understand

Thanks Smokey.
Thats what Im thinking too. It sure gathers alot of water thou.
Funny thing is that the pipe is in a cold area all the way from the 'T' to the roof. Its actually located on the stairhall to the basement and its not heated.
But obviously its not warm its not as cold as outside.

So the question is can this condensation be avoided and how?

Can you explain what "dead air the flue at the bottom" means?

Thanks for the reply.
I cant unhook the flue from the stove.
The stove is a few inches from the wall and on the other side it has a "T" and then goes to the roof.
Would putting a rag just above the horizontal section of the flue work?