If you need extras, this is the place to get 'em. They work great.

If you don't want to buy and extra tool just to put on a fitting these do the job!

I've seen a lot of comments, especially from installers, about how these are not as good or professional as the crimp on or compression settings. I'm not a professional so I can't offer an opinion on that but I can tell you that for do it your selfers that don't want to purchase an additional tool for installing your system, this connectors work just fine. I use them and as long as you strip the cable right and apply the connector properly they do a great job.