Thanks for telling me that the picture I posted was to small to notice that it was black, unlike the BVM, U.P valves and nearly all others other than the Yellow aircraft retract valve! I just assumed that if you were familiar with this valve that you'd be EASILY able to identify it. Here's another LARGER one for those of you who can't notice that it looks black.
Thanks Shaun for your help. Your Right,....it is a yellow aicraft retract valve!
Thanks very much
Don