Hi Ozzie,
If you are using those red hose fittings, put a 3" gear clamp on the hose once you thread the fittings in.
A friend was using a red threaded coupling last summer, (it was pretty warm day). When we dumped his black tank, the hose pushed off of the red fitting. I'm sure you get the picture
. Maybe the plastic hose became too pliable when warm, but a couple of gear clamps will stop that from happening.
Sewer hose is one of those things (that you get what you pay for)
More you pay, the better it is
.
J&D