What kind of tape do you use mostly in duct tape applications?

I'm out of gaffer's tape, only had a six year supply when I retired, and I
just used the last. Bought some Gorilla tape once, and it was really tough,
and stayed soft a while.

I need to tape a hose onto a fitting on a vacuum. Already have screws and
hose clamp, but have to seal some holes because hose had to be split to fit
over fitting.

Is there any equivalent to gaffer's tape, and where it is sold, what is the
"proper" name for asking a parts man?

Steve