Depends on what pump you're talking about, and what stone, but all the Airstones I've seen seem to work the same way. You should have a small air pump (they're usually blue, and come with the airstone), the stone itself, and a long bit of clear tubing. One end of the tube goes on the pump and the other end goes on the nozzle of the airstone. The pump, being plugged in, pushes air through the tube and into the airstone, where it comes out the porous stone and oxygenates the tank.
Considering that this pump is plugged into electricity, I would think it's a horrible idea to put it into the water. I hope you weren't thinking about doing that...?

i meant only the blue stone attached to the tube.. the pump is in a dry place

People have been coming to me for advice so long, I might as well do this all in one spot. I watch a lot of unfathomable Japanese TV and drink a lot of coffee. I'm a freshly-hatched Illustration major, formerly trapped & dying in the American South, now busily teaching phrases to all of Nagoya Japan. I'm always on the lookout for more video games and sushi.
I have lots of interesting pets. Wanna see my beetle?

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