Rancilio Lever Piston Spring cafe-supplies/ceramic installing it backwards will block

installing it backwards will block flow entirely

If you're installing this on an Appia or Aurelia

rated 16(4)A at 250V and sized for the standard 22 x 30mm mounting hole found on most commercial machine control panels

In-housing swap

snug it down for a proper seal

Rancilio Lever Piston Spring cafe-supplies/ceramic installing it backwards will blockRancilio Lever Piston Spring This 44 x 168 mm spring is used across every commercial Rancilio lever model, from the S 10 through the Classe 7. This is an after market version; for the OEM part, see R_1518. SPECIFICATIONS 44 mm x 168 mm COMPATIBILITY Fits: Rancilio commercial lever models, S 10 through Classe 7 Replaces: OEM equivalent R_1518 INSTALLATION A technician level job, the lever piston assembly requires disassembling the group, so this isn't