Rancilio Silvia Water Jetbreaker For Counter-Sunk Shower Filter & Pan-Head Screw - #23-000-458

Designed for the Rancilio RS1 model, but will fit all current commercial and domestic Rancilio group heads, including all versions of the Silvia.  The kit includes one M5x16 mm flat head counter-sunk screw and one new version counter-sunk jet breaker (21 x 5.1 mm).

This should be paired with a screen that has a counter-sunk area like the Rancilio Specialty Precision Screen.