as I said, it's PEX, high density polyethylene, a different type of "primary wire" .... and it's not generally found in any parts or electrical/electronics store because it's overkill, not because suppliers 'think you don't know better' .... current OEM involves computers and all the latest and greatest including using the XL plastic for the ducting but that doesn't make it "higher quality", spend the money if you wish, but no truck we deal with here came with it and as I said for your query, it is not "necessary" providing your routing the wiring properly, as original

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics