Does anyone have a picture of an original Model A Petcock? Are they the same for 28-29 and 30-31? What about 31+?
I found a bunch (22) of drain valves in an old industrial warehouse. They were used as drains on air lines. I think they look like Model A petcocks but I would like to compare it to an original. They are all brass with 'BB' stamped on the 'wing'. Some have steel washers over the spring and some have brass washers. Some have steel cotter pins and some have brass cotter pins. And, it looks like some parts are red brass and some are yellow brass. They were covered in decades of old oil and dust. I bead blasted a few and they look like brand new. I will try to post some pictures of them.
John
NNY