The Rocket R58 Chrome Knob Cover O-Ring is an itty bitty replacement part. Hard to say how these little guys disappear but it is always wise to order more than one because inevitably they migrate to the oddest places, like under the couch and you find them years later since you fixed your espresso machine on the coffee table while watching our YouTube How-To videos.
Rocket Espresso Part Number: C400002786
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Regular Price: $34.95
Our Price: $24.95