This is a quick adaptor I modeled in Tinkercad to solve the problem I was having with my pool vacuum hose when vacuuming the pool. The hose would not quite fit down into the drain for the skimmer, causing it to come loose, usually when I was on the other side of the pool. This adaptor fits down into the drain on the small side and fits the hose on the bigger side. Works great! Hope this helps anyone else who has the same problem.