Flexible fiberglass like diaphragm (theres another one inside the motor housing)
6.jpg
Top plastic piece and misc parts in background. Check valve is visible on outlet.
7.jpg
Cut out the check valve to see what it looks like -- just a spring and piece of rubber.
8.jpg
Cut out the pressure relief valve. Bigger spring and rubber ball.
9.jpg
Motor connected to the gear-rotor.
10.jpg