Portable Air Conditioner Hose Connector for Both 5.1"/5.9" Exhasut Vent Hoses with Clockwise & Counter Clockwise Threads, Universal Mobile AC Unit Vent Hose Coupler Coupling Extension

I have 2 of these and was able to extend the ac way out into the room, 16 feet from the window if I need to. I haven't tried the OD, just the inside so far

A must for portable A/C exhaust. Necessity to add another length of 5.1" hose. So much length lost making the bends to get to the window. Seems to reduce amount of leakage at unit & window fittings since double hose has less tension at the ends. Good purchase.

I use this to connect my old 5.1" AC duct to my new AC with a 5.9" duct. I had to remove the existing connectors on the ends of the new and old ducts before attaching the adapter. Then I screwed the 2 ducts into the adapter. I've been running the AC all afternoon with no issues. The adapter stays connected and there is no air escaping from the adapter. Trust me, I'm not the least bit mechanically inclined but I got it to work just fine.

Very helpful adapter, fits and holds great

Great for adapting two hoses. The ring in the middle allows you to have something to hold onto, if the hoses are not cooperating. The ring is also helps to provide a guide for applying duct tape. It worked so well, I bought two (one for intake and one for exhaust.

Only kind of worked. The one that goes over the tubes works much better, but I can’t find it—so bought this as a replacement. We’ve had to add duct tape to keep air from escaping the connection. It’s solid plastic, very hard to install, and absolutely not worth a dime.

This works with the new added extension

This is advertised and the demensions show that it fits 2 sizes. This is not the case .This part almost seems to be sized for 2 but smaller on the large size. 5.9 hose is too large .