Thx for comment on sizing. And yes, there is a significant price
difference. Would Nashua #345, "Industrial Grade HVAC Duct Tape" be a
good one to use?

SQLit wrote:
The closed cell provides more insulation value. A lot harder to find as it
is a lot more expensive. Get the size for your pipe, snug fit. Then use
plenty of duct tape to hold it on. I use only the metal tape as the other
stuff releases in a couple of years from the heat.
A good razor knife and your good to go