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Petroleum technology|Nuts|Pressure testing|Mineral oils|Threaded components|Pipe couplings|Unions|Freight transport|Lubricants|Pipe caps|Petroleum products|Dimensions|Swivel pipe connectors|Pipe fittings|Serrated|Marking|Wrenches|Hexagonal shape|Pipe plugs|Screwed fittings|Pressure|Design|Hose connectors|Gasoline|Threads