I've been trying to find a product to no avail (lest I disassemble something myself). What I'm looking for is an in-line air pump, powered by either DC or AC (DC preferred). So electric motor. In/Outlets are just small for rubber tubes. It doesn't have to be too strong. It will be moving air, not water (which I know creates problems with cooling sometimes in electric motors). I haven't been able to find it, but I have found those portable balloon-inflaters. I guess thats about the strength I'd need (maybe 1-4psi?). But they're large, and the inlet is the width of my hand, while the outlet nozzle is 1/4". So a large fan, medium rpm, large inlet. I guess the physical size I'm looking for is something of the order of those in-line water pumps for hoses that are powered by drills. Smaller fan, higher rpm, smaller inlet. Does anyone have any ideas? Its tough to find online as air/water/fuel pumps from automotive really flood the search results.