Elliot, would you please look back in your company history and see if you tested 4" PVC pipe for use as a WTE? My current project is using just that, but of course my max working depth requirement is only 50 feet. With that in mind, and knowing that PVC pipe probably has wide inner diameter tolerance, any idea on how forgiving your end enclosure seal is for id tolerance? Right now, I am just using 1/4" plexiglass glued on plate flanges, but with 16 clamping bolts to deal with that is a real pain. I can afford to use your enclosure, but I like to be as innovative as possible wrt cost. Thanks.