Note – This is the old style lower that has a connecting pin through the pump shaft that has to be extracted, before the pump lower can be removed from the machine.
For the new style ST Max and Classic Airless sprayers go to – https://www.sprayman.co.uk/product/graco-pump-kit-17c489
Graco Pump Lower for Old Style ST Max and Classic Airless Sprayers (None PC) – 17C719.
Need to chat call Sprayman UK on 01543 496 289.