Looking for ballast bellows, air pumps and valves
 

As the title says... :arrgh!:

I'm making a 'submarine device' and looking for miniature bellows and pneumatic air system. This is a self contained air system pumping air into and out of the bellows, from a reserve pressure tank.

This sub is a 100mm diameter perspex tube with two sealed domes on each end. The bellows (2 of) is to fit in each of the dome section of approx 50mm radius. Complete attitude control is not necessary, but depth control is important. I'm designing my own control system as there are a few gadgets to put into this 'sub'

I'm looking at RC and other industrial websites, but nothing yet.

If anyone has experience with this and know where to get these things it'll be a great help.

Thanks
Van
:up: