I'm trying to winterize my pool by myself this year. I paid a pool guy to do it last year and watched him and took notes. He blew out the system using a shop vac attached to the skimmer inlet port. I do not have a main drain - the shopvac was able to blow all equimpent and lines quickly. He had what looked like some flexible tubing on the end of a shopvac tube. My skimmer is a waterways. Not sure of the model. The inlet port is threaded. I have a generic gizzmo that screws into this using the larger of the 2 threads on the gizzmo. The gizzmo says this is a 2 thread. There are many skimmer hose adapters for sale but most of them say the threaded size is 1.5 - none say 2 Is 1.5 the inside dimension?417-6060 - WATERWAY - ADAPTER, POLY Should I just buy thisAmazon.com : Hydro Tools 89343 Skimmer Winterizing Kit : Swimming Pool And Spa Supplies : Patio, Lawn Garden I called waterways and they were not helpful. Referred me to another company.