Second hand spare part for almost all 1 1/2 ajax style piston pumps . Cast iron. 
Most have been sandblasted, primed and the sealing surfaces cleaned up on a lathe
Some are different, I can supply the other styles too
Can post anywhere in Australia
To inspect please contact me through ebay
Can supply gaskets to suit. (Extra)
Check out all my videos on overhauling these pumps by checking out my Youtube channel. Channel name is SHEDASAURUS and most videos start with the words -Piston Pump 1 1/2"