[AT] Tractor PTO tire pump help needed

[John Wilkens]

While waiting for those wd45 engine parts to arrive I'd like to 
finish another little project but one part has me stumped.  It's a 
complete tractor PTO air pump that is ready to go except for the 
valve fitting in the top of the cylinder that is missing.  It has to 
be some kind of one-way (or two-way) valve that screws in.  I've seen 
pictures of the pump on ebay but I can't figure how the valve 
works.  An inquiry on Y.T. didn't get any results.  Does anyone have 
and extra valve to sell or loan so I can fashion a 
replacement?     Thanks!    ....and happy New Year!!

                    In the wide-open spaces of NE Oregon