Has anybody used these? I never heard of them until last year when tech #2 started working for us. He mentioned it a couple times, and Ewing got a couple in because he mentioned it to them. I finally bought one this spring for him, and watched him use it yesterday on a cracked manifold. Thing work great!! He has used it a few times this year already. It has helped prevent having to rebuild and entire 8 zone manifold just because an ell and pipe cracked leading into the first PVC mani tee. Cored out the PVC to where all I saw was primer on the inside of the tee. We only picked up the 1".
I can't find a good pic or link, but this link is to a plumbing supplier with a couple weak pics.