Right -- tension fit. It has little spring-plate thingies (technical term) on either end. I've never seen anything like it before!
I usually put a little electrical-silicon-grease on electrical stuff before putting it back together too, but that's just me.
Dan
PS -- I was actually thinking of Bow-Wow before Pelican. I wonder if there's a price difference between VW fuses and Porsche fuses?