Gaggia CC: steel wire clips might need to be bend a bit downwards to fit.
Lever machines: steel wire clips might need to be bend a bit downwards to fit.
Ascaso Dream, Arc und Basic: Espazzola doesn't fit, rim of the group-head is too narrow. All other machines (including Dream PID) are compatible!
Bezzera Hobby, manufactured up to and including 2014: Espazzola doesn't fit, rim of the group-head is too narrow.
Breville (a.k.a. 'Sage', all machines): Espazzola doesn't fit.
GRAEF (all machines): Espazzola doesn't fit.
Illy Francis, Francis!: Espazzola doesn't fit, rim of the group-head is too narrow.
La Pavoni, Domus Bar and Domus Casa: Espazzola doesn't fit, rim of the group-head is too narrow.
Lelit Anna (PL41LEM, PL41EM, PL41QE) , Anita (PL042TEMD, PL042EMI, PL042LM, PL042QE), Diana (PL60R1), Grace (PL81T): Espazzola doesn't fit, rim of the group-head is too narrow.
Vibiemme Lollo: Espazzola collides with backplane behind group.
QuickMill 03035, 02820, 02835, 03004, 03035 'Pegaso', 03035 PID, 0820, 0835, 3130, 3135, 3140, 3145, 3230, 3235, 3240, 3245, 03000 'Orione': Espazzola collides with guiding pins in group head.
Reneka: Espazzola doesn't fit, rim of the group-head is too narrow.