Shower hose fittings problem

[kejones62]

I have a Jayco travel trailer. I needed to replace the shower hose, so I bought one off of Amazon. I can screw the 'head' end of the hose onto the head, no problem. However when I go to screw the other end onto the faucet diverter, it goes on maybe a half turn and sticks. At this point the internal mating surfaces are not pressed together - the hose rattles loosely in the nut - so it is not a watertight seal. I've played with this for hours, although the fittings look the same, and the thread pitch is the same, the fittings won't go together. Has anyone had this issue before? Is there some adapter I need? I thought these things were all 'universal'.
BTW, this is the hose I bought. Cheap enough to just get a different one, but I don't know if that will help. Blissland Shower Hose

[kejones62]

if I grab a 1/2 NPT male, I can screw it into either end of the hose. However on the end that goes into the diverter, I can only get it a few turns before it starts to tighten. The threads are definitely 1/2"-14, but maybe the taper is off? I can actually get it more than 1/2 turn onto the diverter - that was a mistake - but I can't get it tight enough to mate the washers. The thread get tight before the washers mate.

[wopachop]

Both ends appear to be the same size.
Does the shower head screw into the other side?

It it only goes 1/2 turn it sounds like a difference in threads or a bad thread job.

[joelc]

Go to a hardware store and bring your head (shower head, too). Let them take a look so you can purchase the right one.

[agesilaus]

Odd every shower fitting I've seen is 1/2 inch pipe thread, 1/2 NPT.