I have never seen that o-ring and rubber cap on a bottle jack. It must be original (?) as in ebay there were three jacks for sale with them.
I refurbished a jack for my project and now I have to get those rubbers. Does anyone have that they could sell me? Shipping the whole jack to Finland does not sound like something that is worth doing.

I refurbished a jack for my project and now I have to get those rubbers. Does anyone have that they could sell me? Shipping the whole jack to Finland does not sound like something that is worth doing.

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