What is it???

Looks like a fire piston used for starting a fire in a survival situation. could be wrong and am probably wrong., but they are cool anyways.

-- Bryan, york pa

I want to say some kind of clamp or tracing styles.
MIKE

-- See pictures on Flickr - http://www.flickr.com/photos/44216106@N07/ And visit my Facebook page - facebook.com/MTEnterprises

Might be a control valve. Push in to activate another tool, via an air line? Push in=”ON”, allow it to return=”OFF” sort of thing. Looks like an air line hook up point near the plunger. Might be used to control a clamp powered by air? Either to clamp or un-clamp, push the plunger in?

-- A Planer? I'M the planer, this is what I use

OMG you have one of them also !
IT does look like an air valve for air clamps.

-- "My mission in life - make everyone smile !"

cracker jacks
surprise for woodworkers

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

I’ll buy air valve for air clamps theory, it has a few rubber seals inside it. Are these expensive? Or anyone near Sunnyvale, CA want it?

-- Michael