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Never reuse your oring when changing parts in your pruis a/c system.This is about 50% of the common Oring and seals. You can easily spend over $1500 in special seals, washers, gaskets , orings, ect. Every year they are coming out with new ones. Whwn I started there was only about 5 to 7 Common orings. a few seals thats it and 4 compressors.