Product review (5 stars): Good extension for portable washer
This was easy to fit as an extension to the discharge hose on my Haier portable washer HLP23E on the smallest of the three diameters (1 inch). I just kept pushing until I met resistance. The material is a somewhat flexible plastic that forms a pretty good seal with the existing discharge hose end, but one shouldn't trust it to stay secure without the hose clamp which is helpfully included.

I bought two styles of discharge hose to try: this one which uses a bracket to bend the end of the hose in a hook shape, and another whose hose end is permanently formed into a hook shape. I still haven't tried the other, but I can see one advantage of this style is you could adjust the location of the bracket if you wanted to cut the hose length down. The bracket also has a small hole, about 3mm, that could be used to further secure the hose, but so far it seems completely stable just hanging over the edge of the kitchen sink.