It took an effort to put the loop through the cable head, but it's really nice once it's fit. I wasn't sure how firmly the cap would stay on the cable while driving, but it seems OK for now. Time will tell.
I like that I can connect it to my trailer connector, and it stays with it when it is in use! It perfectly prevents corrosion and keeps snow or rains out, so everything will still work at the end of the day and in the future.
Takes a bit of effort to stretch the ring over the 7-pin, but it's nice once installed. Fits securely on the connector. So I'm happy with that.
This dust/dirt cover was a must for my new RV cord, will keep first and any debris out of the connections. Nice purchase.