heart surgery!

The ULKA CS M3886 piston pump from my Delonghi Bar 5 espresso machine. The small images link to bigger copies. Top row: (1) assembled pump (2) after opening the top screws (3) exploded view of the inner tube (4) close up of the upstream parts // Bottom row: (1) close up of downstream parts (2) topmost end; the metal tube leads to the boiler; the rubber hose to the water tank, bypassing the pump for steam (3) inside view of the outlet valve (4) my cat rearranging all, but I have the pictures, so I win