[rooster]

Thank You Richard.  I removed the plug from the valve, it appears to be a 1/2 inch NPT plug.  Air poured out so I figured I had the wrong relay.  Pulled the plug from the other, which I am quite sure is the spring brake relay, and again air came out in great volume.  It would seem that I need a source that would not be under pressure until service brake is applied, so I am stumped.  I will try to get a picture posted.  pk