I ran into an issue with my Portable Air Conditioner, TOSOT 10,000 BTU(ASHRAE) 6,000 BTU (DOE) Portable Air Conditioner; They have roughly a 5.6" exhaust hose, which I needed longer but they don't sell. I accidentally ordered a 5.9" exhaust host, so this is a slide in kit for 5.9" exhaust hosing.

Threading in the exhaust hosing does need some help due to this is my first time doing this type of threading, manipulate the first thread into the heighest thread on the adapter then you should be able to start screwing in.