forgot to order a plug
I simply provided the links from FrozenCPU since they have the largest selection of watercooling parts; I was looking for an answer of which of the 2 you were talking about.
There are shops that ship internationally, it just depends on what you are looking for.
As for pump tops, I really haven't heard of a pump top ever causing the demise of a pump. User error from installing the pump top or letting it run dry (after adding the pump top) are highly likely the cause for someone to blame a top. The main causes of pump failure are running it dry (bearing/impeller failure), or over-volting...and the simply die after a while, like any electrical/mechanical component.