I just ordered the Camco wrench set that John mentioned. If you read through the write up on AMAZON they say they work with the Camco Rhino Flex fittings along with their Revolution and hint that other brand hose fittings can be disassembled as well. I have some Revolution hoses though one length is leaking along with a new Rhino Flex system. The Amazon reviews say they work anywhere from great to being a piece of junk.
I also looked at the Valterra JR version and those reviews were pretty bad.
If they turn out to be junk --- $12 bucks wont hurt too bad (they went up in price today
) and will join that big box of 'stuff' left over from 40+ years of owning RVs.