35 x 30 x 2 mm, three are used per group head on the E61 manual group, only two on the solenoid operated E61 type. A slightly O.D. version (1 mm) is also available.
Used specifically in:
Bezzera
Brasilia
ECM (Germany)
Expobar
Isomac
Reneka
Sanremo
Vibiemme