Replacement solenoid coils for Gaggia espresso machines, available from Coffee Spares Direct. Solenoid coils commonly come in two different types, two way and three way. The two way acts as an automatic valve letting steam or water through when energised. The three way works in the same way but has a third outlet on the top of which relieves the pressure from the valve when not energised. Do not remove the coil and energise as this will burn the solenoid coil ou. Coils or whole coils including the brass base and valve guides available
 
Gaggia Flow meters, these measure the amount of water (volume) flowing through to the group heads. Commonly used on semi automatic espresso machines. Internally these have an impeller that rotates when water passes through from the pump of which sends a signal to the micro processor