Does this look normal? This is a new hose I installed in 2021. The section between this hose and the thermostat housing started leaking, so I had to pull it off and investigate.

This Amazon link is what I bought, but I'm not sure how it became this "Master Pro" thing when I was expecting AC Delco. I guess maybe I shurgged it off back then and thought a hose is a hose.

All the other hoses I replaced are AC Delco and they're just fine. Poor quality hose maybe?
I am definitely replacing this because it doesn't seal the thermostat housing anymore. I'm guessing some hoses are better made than others?
So far I am unable to separate thermostat housing from the hose.

 

That's an awfully deep clamp channel.

 

That doesn't look right.

When it comes to rubber materials, there can be differences in quality.

I'd stick with AC Delco or Gates.

 

The hose is Chinesium crap and is mostly plasticized rubber because plastic is a lot cheaper.

The clamp groove is both from a clamp that was too tight - perhaps the wrong design and then coupled with cheap almost-rubber, it's a case of guaranteed failure.

Here's a trick for you to learn ----
If you have real hose and it's on a metal nipple - like the thermostat housing - and that nipple is ultimately grounded .... then taking a 12V test light, hook the clamp onto the B+ side of the battery and touch the tip of the tester to the clamp.

If the light even glows a bit, then the clamp is tight enough. I caveat --- if you're using poor quality hose --- this won't work.

If this works for you, then your assignment is to tell everyone WHY it lights up.

Remember --- REAL rubber hose - not silicon or wannabe-hose with plastic ingredients.