10PCS/Pack 16x25x2mm Copper Washer Solid Gasket Sump Oil Seal This copper washer gasket set provides a durable, crushable seal for oil systems. Each washer is solid copper with a size of 16x25x2 mm (inner diameter 16 mm, outer diameter 25 mm, thickness 2 mm). The pack includes 10 washers for multiple sealing points and spare parts. Key benefits Reliable seal under oil pressure by forming a tight crush seal between mating surfaces. Corrosion resistant copper suitable for engine oil, transmission oil, and other oilbased fluids. Malleable and easy to crush to fit irregular sealing surfaces, helping to reduce the risk of leaks. Long service life in automotive and industrial environments due to stable metal composition. Convenient 10piece pack for multiple seal points and replacements. Key attributes Material: Copper (solid washer gasket) Size: 16 x 25 x 2 mm (ID 16 mm, OD 25 mm, thickness 2 mm) Quantity: 10 pieces per pack Function: Sump oil seal gasket, drain plug washer, sealing ring Applications: Suitable for sealing oil sump connections, drain plugs, and connections requiring a 16 mm ID copper washer Compatibility: Designed for sealing surfaces compatible with a 16 mm inner diameter and 25 mm outer diameter Performance: Provides a durable, oilresistant seal with copper's malleability for a reliable gasket Use cases Automotive oil pan drain plug: seal between the drain plug and oil pan to prevent oil leaks during engine oil changes. Hydraulic line connections: seal on banjo bolt fittings or other oil/hydraulic line connections to prevent fluid leakage. Small engine and gear systems: seals in generators, lawn equipment, or gearboxes where copper washers are specified for oil sealing. Installation tips Clean all mating surfaces before installation and inspect for deformation or damage. Place the copper washer between the bolt head (or fitting) and mating surface, then tighten to the recommended torque for the application. If the washer becomes deformed or compressed beyond acceptable thickness, with a one from the pack to maintain a proper seal.