Details
The smaller of the two o-rings used with the 12 mm diameter cool touch steam wands, measures 5 ID x 1.8 mm. This is installed on the inside of the steam wand tip, sealing against the cool touch tubing.
A bit challenging to fit in to place, it's best to get one side in the slot it sits in, then (carefully, with a pick tool) push the other side down, past the slot, then pull it back up to seat it in.
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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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