This 10PCS/Pack Copper Washer Solid Gasket is designed for reliable oil sealing in sump and related systems. With a compact 6x18x2 mm size, these copper washers provide a durable, conforming seal for small flange and bolt connections. Key benefits Reliable sealing material: solid copper offers good malleability to conform to mating surfaces, helping to prevent leaks in oil systems. temperature and oil resistance: copper maintains seal integrity under engine and equipment temperature changes and in oily environments. Value and convenience: a ready pack of 10 pieces ensures you have replacement washers on hand for maintenance or repairs. Key attributes Material: copper (solid washer gasket) Size: 6x18x2 mm (inner diameter 6 mm, outer diameter 18 mm, thickness 2 mm) Pack quantity: 10 pieces per pack Function: washer and gasket for oil sump seals and related applications Compatibility and performance Designed for applications requiring a 6 mm bore and an 18 mm sealing contact diameter. Suitable for automotive, motorcycle, and small machinery oil sealing needs where copper sealing washers are applicable. Provides a dependable seal in sump oil drain and related connections when used as a gasket washer. Applications (use cases) Oil sump drain plug seals on small engines or motorcycles. Sealing flange joints in oil lines, gearboxes, or lubrication system connections. General copper gasket replacement for 6 mm bolt applications in automotive or light machinery. Usage guidance Ensure mating surfaces are clean and of debris before installation. Place the copper washer correctly over the 6 mm bore and tighten to the specified torque. Do not reuse a deformed or damaged washer; with a one from the pack. Notes Solid copper construction provides durable sealing performance in oil environments. Pack provides ten individual washers for maintenance or multiple connections.