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Marking|Hydraulic equipment|Toroidal sealing rings|Sealing rings|Design|Pipe fittings|Threads|Nuts|Preferred sizes|Hose connectors|Pressure testing|Test pressure|Temperature|Instructions for use|Performance testing|Leak tests|Endurance testing|Angles (geometry)|Screwed fittings|Pipe couplings|Service pressure|Steels|Hydraulic transmission systems|Diameter|Designations|Hardness