"As a bathroom fitter I will continue to use these until they cause me problems, I've never had the inner seal come out, in fact I used to use the Kwickfit ones with the black inner seal and they were the ones that came apart especially when you removed them."
"The product does what it ment to do. remember to use a little liquid soap when attaching to pan boss and then offfer up to soil pipe. if you don't do it in this sequence it is possible to dislodge the seal and hence have a leak. A very good value product"