If you look at: http://wiki.ffxiclopedia.org/wiki/Ca...on_Attachments

this will list the ones that requires maneuver in the descriptions.

As for the 2x water symbol, I think you're talking about 'elemental capacity' of that attachment which is how much of certain elemental capacity it will cost to be equipped on your pet. Basically, each Head+Body Frame will give you a number of different elemental capacity that you can use for your attachments.