I have 90 of the O-rings that seal the filter housing. Let me know if you need any and I would be pleased to mail them. They cost only $0.06 so don't even bother :)
BTW there are many sources for the Fram CG-12 filter used in the 804 pump in the USA. This is one of the better quality examples: NAPA CG-12
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Christen 804 "Wobble" pump
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