[Biff]

If you use the fittings with the little screw adjuster (flow control) you can affect the speed that a piston moves (somewhat) this can help in a situation where you want to slow down the piston if it is lifting something heavy while pushing but you want it to come back slower when pulling. Sorry don't have a good picture handy. Also not sure the flow control fittings are part of the kit this year.
Biff