I have hunted all over the web searching under every term I could think of to find out what this is. Can someone please shed some light on what this is. I put the key next to it show the size of it.
To me it looks like a water neck but I have no idea for what. I see the "BW" on it and the threads look taperd like a pipe thread. If you put "cast water neck" into Google and hit the "images" button, you'll see plenty of similar parts. I rest my case
The BW is Bendix-Westinghouse and that part is a discharge port fitting for a truck air brake compressor.
English car? I don't have anything from across the pond any more but for some reason it looks familiar. Tim
The BW is Bendix-Westinghouse and that part is a discharge port fitting for a truck air brake compressor. This one is brass, thanks for all the help. this was going to bug me until it was solved.