Rancilio Xcelsius Temperature Sensor Probe common-universal-rancilio-parts/pumps-and-motors Technician recommended - this is

Technician recommended - this is a pressure safety device and should be installed and tested by someone familiar with boiler service

CMA Boiler Pressure Gauge

Because it's held in place purely by the group gasket's compression

Two AA batteries are included

Rancilio Xcelsius Temperature Sensor Probe common-universal-rancilio-parts/pumps-and-motors Technician recommended - this isXcelsius group head temperature sensor kit (wire + probe) for Rancilio Classe 9 and Classe 11 models. AISI 316L stainless steel construction. Fast shipping when in stock. When out of stock this becomes a special order item and typically requires 6 10 business days for processing prior to shipping. Specifications: Wire part #: 10110876 Probe part #: 34070115, extension part #: 10110876 Material: AISI 316L stainless steel O ring not included