Here is one example of many that we frequently work with. For this person, their chase was rusted to the point where it was causing the whole chimney to leak into the house. For this we replaced the worn chase cover for a brand new one, along with a shiny new cap. Being made from stainless steel, we guarantee for life that a cap or cover bought from us will never rust and if it does, we will replace it.  

Here are some more examples of caps and covers that we've done: