12 x 135mm Sight Glass

12 x 135mm Boiler Sight Glass

Replacement sight glass, 12 x 135mm, for La Cimbali M15, M20, M25, M27, and M30; Faema Star Tronic; and Nuova Simonelli Optima boilers. Also cross-referenced under the older part number C_477.

COMPATIBILITY

• Fits: La Cimbali M15, M20, M25, M27, M30; Faema Star Tronic; Nuova Simonelli Optima
• Replaces: C_477 (older part number)
• Works with: on Nuova Simonelli Optima installs, pair with gasket S_48 — this model requires it alongside the sight glass

INSTALLATION

Handle the glass carefully to avoid chipping the ends, and don't over-tighten the retaining nuts once installed.

PRO TIPS

• On the Optima specifically, skipping the S_48 gasket is a common installation mistake that leads to a weeping sight glass almost immediately — order both together for that model.