Cool...yeah I was thinking that the valve on the air intake tube might be a good idea. When I first set it up, I put my finger over it to see if it was sucking in air. When I completely covered it, the water in the chamber rapidly rose up into the neck. I just wasn't too sure how that would affect its operational efficiency. I'm not sure if more air is better simply because it'll make more bubbles...I wouldn't want to restrict air flow if this is the case.