Shackle bush removal tool

had this for a couple of years now, used again today, makes a ■■■■ job so much easier one of the best tools ive bought .With the lack of grease ■■■■■■■ on bushes these days it makes changing metallastic bushes a lot simpler no cutting gear or 12lb mel needed.

Looks good, I still use a home made one I made some years ago. Is that one hydraulic or air powered?