I was pointed in that direction first... their Cunifer™ line is pretty awesome. But they did not have a 6mm bubble flare union, and their only tool was ~$400... and out of stock. Their rental tool does not do bubble flares. It looks like their Cunifer line is much, much easier to work with though, so if you're doing more than one or two small sections, it's probably worth investing in a bulk roll with the appropriate fittings.