Not to get off topic but can I ask a question,why dont you fellas who invent,test and build these pipes not simply put a patent on that particular design?? Hell you can file for a patent for a mere 30.00. It seems to me that would leave no question in any one persons mind as to who actually invented a particular pipe.. Just a thought.. It also seems to me that if any one person has or had a problem with the work,cutomer service,product, ect. with a builder that they would try any and all means to resolve that issue before coming on the internet to flame,bash or simply slander that particular builder simply because by doing that I do not see that builder trying to resolve that particular issue after the customer had gone and done those things.Again just a thought as a neutral party.