Details
O-RING 6.07 mm inner diameter x 1.78 mm thick, EPDM 105 rubber, Rancilio #36402001. Stock O.E.M. replacement part Rancilio Silvia Steam Wand/Valve Shaft O-ring (not for the tip). In the pre-2008 (Versions 1 and 2) Silvia, you will more than likely need two each of these for both the steam wand and/or valve or 4 x total. In all post-2008 (Version 3, 4 and 5) only two are needed for the steam valve, and they are not used in the wand.
Also used by Rancilio as a solenoid flange o-ring, as well as the Epoca (one group) group head flange.
As with any o-ring and moving parts, lubrication is highly recommended.
Customer Reviews
Yes, all moving parts, even springs, should be maintained with a food-safe lubricant
O-rings don't last forever, and eventually these flatten and or get hard and brittle and break
In its most common application, for the Rancilio Silvia steam valve, it seals the valve stem, keeping steam from escaping out the front of the valve. Also, with older Silvia's version 1, it seals the steam wand to the valve
The best tool is a dentist's pick
Attention CA Residents: Prop 65 Warning
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.

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