Nuova Simonelli Shower Screen  €5.90

Details:
This is an after-market product and not the original La Simonelli - it will fit and act the same  

Stainless steel shower screen for N Simonelli coffee groups.
It is good shop policy to replace shower screens every 2-3 years as the holes get blocked eventually and you won't get full espresso extraction.
   
Size: 
Diameter  57.6mm x 5mm depth
Screw hole  Ø 6mm