Tuning Hatsan O rings

I have a carnivore and ordered a O-ring set from them since the the spares that came with my rifle were old and dry. I was supper bummed to find out that brand new set was the same. I dont know what kind of old garbage O-Rings they are buying but I got fed up with it and went on amazon and ordered o Assorted O-ring set for like $20 been replacing the original O-Rings and the rifle is shooting so much better Id recommend not buying their garbage and getting a large assorted set like these. 
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One box is metric and one is standard.
 
Hello, I have Hatsan Sortie .22CAL (5.5mm) semi-auto PCP. I will need to replace x 2 O-rings on the fill nozzle but I am not so sure about the dimension of this O-rings whether in mm. or inch unit. I could not find this information in the Instruction Manual. Could you please advice the dimension of this O-rings? And I would be appreciated if you could also guide me to any document for "other rubber parts" of Sortie, so I will periodically further consider to replace them in due time before broken. Many thanks in advance for your advice.

Best Regards, Boon ([email protected])

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